Can you put a fly sheet on a wet horse?

Picture this: a sudden summer thunderstorm rolls through just as you're heading out to the barn. Your horse is standing in the pasture, soaked from the rain, and the flies are already starting to swarm. You grab his fly sheet to offer some protection, but then you pause. Can you put a fly sheet on a wet horse?

The short answer is "it depends". It's best to wait until your horse is completely dry before putting on a fly sheet, however Kensington's Textilene has 78% breathability and more structure than other sheets on the market, so it clings less and is more forgiving of moisture.

In this guide, we'll explain why wet horses and fly sheets don't mix, walk you through proper drying techniques, and help you understand when it's okay to leave fly sheets on in the rain. At Kensington, we've spent over 70 years developing protective gear that keeps horses comfortable and healthy, so we know a thing or two about managing moisture and fly protection.

Why you shouldn't put a fly sheet on a wet horse

Let's break down exactly what happens when you put a fly sheet on a horse that isn't fully dry.

The risks of trapped moisture

When a horse is wet, whether from rain, a bath, or sweat, his coat is holding moisture against his skin. Putting a soft, form-fitting fly sheet on top traps that moisture in place. The mesh fabric, designed to allow airflow, instead presses against the damp coat and creates a humid microclimate right against your horse's skin.

Wet fly sheets also become heavy if they are an absorbent material. What starts as a lightweight protective layer can become a sodden weight that clings to your horse's body. This added weight puts pressure on specific points like the withers, shoulders, and hips, exactly where you don't want concentrated pressure.

Good news - Kensington's Textilene doesn't have either of these issues!

Health concerns for your horse

The damp environment created under a wet fly sheet is a breeding ground for skin issues. When moisture stays trapped against the skin for extended periods, it can lead to:

• Skin irritation and rubbing from the wet fabric pressing against sensitive areas

• Bacterial growth that thrives in warm, moist conditions

• Rain rot (dermatophilosis), a bacterial skin infection that develops when the hair's natural protective oils are compromised by persistent moisture

Horses with sensitive skin, allergies, or conditions like uveitis are especially vulnerable. These horses often need fly protection the most, but their skin is also more reactive to the irritation caused by trapped moisture. If your horse has pink skin, pale eyes, or a history of skin sensitivity, you'll want to be extra cautious about ensuring he's completely dry before blanketing.

Comfort and fit issues

A saturated fly sheet that clings doesn't just sit differently on your horse. It shifts, slides, and creates friction points that wouldn't exist with a dry sheet. The shoulder area is particularly prone to rubs when a sheet is heavy with water. Over time, this can create sore spots that make your horse resistant to wearing fly gear at all.

There's also the simple matter of comfort. A wet sheet that plasters against the horse is cold against the skin, especially if temperatures drop or a breeze picks up. Your horse can't tell you he's uncomfortable, but he might show it by acting fidgety, trying to rub the sheet off, or developing an aversion to being blanketed.

How to properly dry your horse before blanketing

So if you can't put a fly sheet on a wet horse, what's the best way to get him dry? Here's the protocol we recommend.

Immediate water removal

Start by removing as much water as possible from the coat. A sweat scraper or squeegee is your best tool here. Work in the direction of the hair growth, starting at the neck and moving back along the barrel and down the legs.

Don't have a sweat scraper handy? You can improvise with a piece of clean bale twine pulled taut between your hands. This works particularly well over bony areas like legs and is gentle enough to use safely around tendons and joints.

Focus extra attention on the back, neck, and barrel. These are the areas where the fly sheet sits, so getting them as dry as possible upfront will speed up the overall drying process.

Towel drying technique

Once you've scraped off the excess water, follow up with cotton towels. Cotton is more absorbent than synthetic materials and gentler on the coat. Work in the direction of hair growth, using a blotting motion rather than vigorous rubbing.

Pay special attention to the pasterns and heels. Dampness in these areas can lead to scratches (also called mud fever or pastern dermatitis), a painful condition that develops when bacteria penetrate compromised skin. A quick towel dry of the lower legs can prevent problems down the road.

Air drying and timing

After scraping and toweling, allow 15 to 30 minutes for natural air drying before putting on a fly sheet. On breezy, sunny days, this process happens quickly. In humid or still conditions, it might take longer.

If your horse needs coverage while he's drying, consider using a cooler or anti-sweat sheet instead of a fly sheet. These are designed to wick moisture away from the coat while providing some coverage. Just be sure to remove them once your horse is dry.

The "thatching" method for emergencies

Sometimes you need to cover a wet horse and don't have a breathable cooler available. In these situations, an old-fashioned technique called thatching can help.

Sprinkle a layer of straw or hay over your horse's back, then apply the blanket on top. The straw creates air pockets that allow moisture to evaporate while the blanket provides coverage. Straw works better than hay because its hollow shafts hold air, but either will work in a pinch.

The key with thatching is to remove the blanket and brush off the straw as soon as your horse is dry. Leaving it in place too long can create its own problems.

Can horses wear fly sheets in the rain?

This question comes up frequently because the answer isn't as straightforward as you might think. Let's clarify when fly sheets can stay on and when they need to come off.

Understanding fly sheet materials

Fly sheets are designed for one primary purpose: keeping insects away from your horse. To do this effectively, they need to be breathable. The mesh construction that allows air to flow through also allows water to pass through.

Unlike turnout blankets, which are made from waterproof or water-resistant materials, fly sheets are intentionally not waterproof. When rain hits a fly sheet, it passes right through to your horse's coat. This is by design. A waterproof fly sheet would trap heat and moisture, making your horse uncomfortably warm in summer weather.

When it's okay to leave fly sheets on

Light rain and brief summer showers don't necessarily mean you need to rush out and remove your horse's fly sheet. If the temperature is above 60°F (15°C) and the rain is passing quickly, most horses will be fine. The sheet will get wet, but so will your horse. Once the rain stops, both will dry out.

Horses with access to shelter can often self-regulate. They'll stand under a run-in shed or tree during a shower and emerge when it passes, shaking off the moisture naturally.

When to remove fly sheets immediately

There are definitely situations where you should remove a fly sheet during rain:

• Prolonged, heavy rain that will saturate the sheet completely

• Cold, wet conditions where your horse needs to maintain body heat

• Temperatures dropping while the horse is wet

In these situations, a fly sheet becomes more of a liability than an asset. If your horse needs protection from wet weather, switch to a waterproof turnout blanket designed for those conditions.

Choosing the right fly protection for your climate

Not all fly sheets are created equal, and choosing the right one for your climate and conditions can make a significant difference in your horse's comfort.

Breathability matters most

The most important feature of any fly sheet is breathability. Look for materials that allow maximum airflow while still providing insect protection. Our Textilene® fabric allows 78% air permeability, meaning air can flow through the mesh even in humid conditions.

Horses that are prone to overheating need sheets that don't trap body heat. Dark-colored horses, in particular, benefit from light-colored fly sheets that reflect sunlight rather than absorbing it.

UV protection vs. weather protection

Many horse owners don't realize that fly sheets do more than just keep bugs away. They also provide UV protection, which is crucial for horses with sensitive skin. 73% UV blocking sheets offer solid protection for most horses.

The trade-off is that UV protection sheets are not waterproof. You're choosing between sun protection and rain protection. For horses that need both, consider pairing a UViator fly mask with appropriate turnout gear for wet weather.

Alternative solutions for wet weather

Sometimes the best approach is to have multiple options available:

• Waterproof turnout sheets for rainy days when fly protection is secondary

• Cotton stable sheets for cooling out after exercise when your horse is sweaty but doesn't need insect protection

• Breathable fly sheets like our Protective Fly Sheet for everyday use when conditions are dry

Having the right gear for each situation means you never have to compromise your horse's comfort or health.

Best practices for fly sheet use

Getting the most out of your fly sheet means using it correctly. Here are the habits that will keep your horse comfortable and your gear lasting longer.

Daily inspection routine

Make it a habit to check your horse's fly sheet every day. Look for:

• Signs of rubbing or irritation, especially at the shoulders, withers, and chest

• Tears or damage to the mesh that could compromise protection

• Proper fit (sheets can shift as horses move and roll)

Before putting the sheet on each day, run your hand over your horse's coat to make sure he's dry. Even morning dew can leave enough moisture to cause problems if trapped under a sheet.

Cleaning and maintenance

Clean fly sheets perform better and last longer. Mud and debris can clog mesh, reducing airflow and trapping moisture. A quick rinse with a hose and hang-dry is usually all it takes to keep a sheet in good condition.

For deeper cleaning, follow the manufacturer's instructions. Most fly sheets can be washed in cool water with mild soap and hung to dry. Never put a fly sheet on a horse while it's still damp from cleaning.

For more detailed guidance, see our article on how to inspect and maintain your horse blankets and fly sheets.

When to skip the fly sheet

There are times when your horse is better off without a fly sheet:

• Extremely hot and humid days above 85°F when any extra layer adds heat stress

• When horses are sweating excessively from exercise or heat

• During heavy rainstorms when a waterproof turnout is the better choice

Bottom line? Fly sheets are tools, not permanent fixtures. Using them thoughtfully means knowing when to put them on and when to leave them off.

Protect your horse with the right gear

So, can you put a fly sheet on a wet horse? You now know the answer is no. Taking the time to dry your horse thoroughly before blanketing prevents skin irritation, rubbing, and potential health issues. It also ensures your horse stays comfortable and willing to wear his protective gear.

The key is having the right equipment for each situation. Breathable, high-quality fly sheets protect against insects and UV rays without trapping heat. Waterproof turnouts handle wet weather. And knowing when to use each one keeps your horse healthy and comfortable all season long.

At Kensington, we've been "Shielding What Matters Most" since 1954. Our Textilene® fly sheets are designed with 78% air permeability to keep horses cool while providing the protection they need. Paired with our UViator fly masks and fly boots, you can create a complete defense system against insects and sun exposure.

Every Kensington product is backed by our Lifetime Guarantee because we believe protective gear should last. Explore our full fly protection collection to find the right solutions for your horse.

Frequently Asked Questions

Can you put a fly sheet on a wet horse if you're in a hurry?

Even if you're pressed for time, it's not recommended. The risks of skin irritation and rubbing outweigh the temporary convenience. If flies are a concern, use fly spray as a temporary solution while your horse dries.

How long should you wait to put a fly sheet on a wet horse after a bath?

After scraping and toweling, allow 15 to 30 minutes for air drying in good weather. In humid conditions, it may take longer. Check the coat with your hand before blanketing.

What happens if you put a fly sheet on a wet horse and leave it overnight?

Leaving a wet fly sheet on overnight traps moisture against the skin for hours, significantly increasing the risk of skin irritation, rubs, and bacterial infections like rain rot.

Can you put a fly sheet on a damp horse after light rain?

'Damp' and 'wet' are different. If your horse is just slightly damp from a brief shower and the weather is warm, you can usually proceed. If the coat is visibly wet or the weather is cool, wait for him to dry.

Is it okay to put a fly sheet on a sweaty horse after exercise?

No, sweat creates the same moisture issues as rain. Cool your horse out properly, allow him to dry, and then apply the fly sheet if needed.

Can you put a fly sheet on a wet horse in hot weather since it will dry faster?

Even in hot weather, trapped moisture can cause problems. The sheet may dry on the outside while the coat underneath stays damp, creating a humid environment against the skin.

What should you do if you accidentally put a fly sheet on a wet horse?

Remove the sheet as soon as you realize, check for any signs of rubbing or irritation, dry your horse thoroughly, and inspect the sheet before putting it back on.