When fly season arrives, most owners reach for a fly mask to stop the head tossing and irritation caused by pests. It is a standard part of summer horse care. However, there is a second, invisible threat that often goes overlooked: ultraviolet radiation. Just as you might wear sunglasses to protect your eyes from glare and damage, your horse requires protection from the sun's rays, especially if they spend most of their day in an open pasture. For horses with full-body sensitivity, a horse protective fly sheet is also a valuable tool in a complete defense strategy.

Choosing a fly mask used to be simple, but today's market offers a range of technical specifications. One of the most common points of confusion for owners is the UV blocking percentage. Is there a real difference between a mask that blocks 73% of UV rays and one that blocks 90%? Or is the higher number just marketing fluff?

The short answer is that the difference is significant, particularly for horses with specific medical needs. At Kensington Protective Products, we have been "Shielding What Matters Most" since 1954. We helped pioneer the use of high-performance textiles in the equine industry, and we have seen firsthand how the right level of protection can improve a horse's quality of life.

The role of UV protection in equine eye care

Eye protection is about more than just comfort. For many horses, it is a medical necessity. The sun's rays can worsen existing conditions, cause painful sunburn on sensitive skin, and even lead to long-term damage like cataracts or cancers. Ultraviolet exposure contributes to the breakdown of proteins in the cornea and lens, which can lead to cloudiness and diminished vision over time.

We often use the analogy of sunglasses for horses to explain why these percentages matter. A horse with healthy, dark-pigmented eyes might be fine with a "light tint" (lower UV blocking), but a horse with a medical condition needs the equivalent of dark, polarized lenses. Without proper shielding, the constant glare can cause squinting, tearing, and general discomfort that distracts the horse from grazing and relaxing.

It is easy to focus only on the flies because they are visible and annoying. But UV damage is cumulative. By the time you notice the signs of sun-related irritation, the damage may already be done. This is why we have refined our protective textiles over the last 70 years to provide options for every type of horse, from the casual pasture companion to the horse with chronic eye health challenges.

What does a UV blocking percentage actually mean?

When you see a UV blocking percentage on a fly mask, it refers to the amount of ultraviolet radiation the mesh prevents from reaching the horse's eyes and skin. A 90% rating means only 10% of the sun's harmful rays pass through the fabric. This measurement is typically taken across both the UVA and UVB spectrums to ensure comprehensive defense.

This protection is determined by the weave density of the material. In our products, we use Textilene®, a specialized industrial-grade mesh made from polyester fibers coated in a PVC compound. The thickness of these fibers, measured in Denier, and the tightness of the weave create the physical barrier against UV light. Our Textilene® is manufactured in Alabama, USA, ensuring that the quality and consistency of the UV filtration meet our rigorous standards.

One of the most common questions we hear is: "Does higher UV protection mean my horse will get too hot?" It is a logical concern. You might assume that a tighter weave meant to block more sun would also block more air.

However, Kensington's UViator CatchMask uses specialized Solar Screen technology that achieves a 90% UV block while maintaining 78% air permeability. This means air flows freely through the mesh, preventing heat buildup and keeping your horse cool even in the height of summer. The PVC coating on the fibers also helps reflect heat away from the face rather than absorbing it. 

Kensington also offers the Signature Fly Mask Collection that utilizes all Textilene and provides 73% UV blocking for horses that don't require the extra protection. 

The technical difference: 73% vs 90% UV blocking

To understand which mask your horse needs, you have to look at the numbers. While a 17% difference might not sound like a lot on paper, it represents a substantial increase in protection for a light-sensitive animal. Think of it as the difference between a standard window screen and a specialized solar screen designed to keep a house cool in the desert.

Our Standard Protective Fly Mask offers 73% UV protection. This is our traditional level of shielding, designed for the average horse. It provides a solid barrier against the sun and is highly effective at preventing coat bleaching and standard eye irritation. It is the gold standard for owners who want durable, everyday protection that stands up to the rigors of turnout.

Our UViator line steps that protection up to 90%. This level is considered "medical-grade" and is engineered for horses that cannot tolerate standard levels of light exposure. This extra layer of defense is often the difference between a horse that struggles with constant squinting or tearing and one that can graze comfortably all day. It uses a different weave configuration that maximizes shielding without sacrificing the 78% breathability our customers expect.

Despite the difference in UV blocking, both lines utilize our signature 1000 x 2000 Denier Textilene®. This material is famous for its durability. It is fire-resistant, fade-proof, and mildew-resistant. Most importantly, it features a ripstop weave. If your horse manages to snag their mask on a fence or during a session of "halter tag" with a pasture mate, the grid pattern stops the tear from spreading.

When 73% UV protection is the right choice

For many horses, 73% protection is more than enough. This level of shielding is ideal for maintenance and general pest defense. It is particularly well-suited for horses that spend their time in paddocks with ample shade or for those whose turnout schedule avoids the peak intensity of the midday sun.

If your horse meets the following criteria, our standard mask is likely the best fit:

• They have dark pigment around their eyes and muzzle.

• They have no history of eye conditions or chronic irritation.

• Their eyes are dark (brown) rather than pale.

• You are primarily looking for a durable mask to stop flies and prevent their coat from bleaching in the sun.

• You want to coordinate with other protective gear, such as horse fly boots, which also provide 73% UV protection for the legs.

The standard mask is a cost-effective solution, especially for owners managing multiple horses or those whose horses are generally gentle on their gear. It provides the same legendary Textilene® durability and Lifetime Guarantee as our premium lines, ensuring it lasts for seasons to come.

When your horse needs 90% medical-grade protection

There are certain scenarios where 73% protection simply isn't enough. In these cases, 90% UV blocking is a necessity rather than an upgrade. For these horses, the mask is a piece of medical equipment that directly impacts their health and comfort.

Veterinarians frequently recommend our UViator line for horses suffering from:

• Equine Recurrent Uveitis (Moon Blindness): This is a leading cause of blindness in horses. Managing light exposure is critical to reducing flare-ups and slowing the progression of the disease.

• Squamous Cell Carcinoma: Horses with unpigmented skin around their eyes (pink skin) are at high risk for this type of cancer. 90% UV protection is the best defense against further damage.

• Photosensitivity: Some horses are naturally more sensitive to light, which can cause them to squint, tear up, or become head-shy in bright conditions.

• Pale Eyes: Horses with blue or hazel eyes lack the natural pigment that helps filter light, making them much more prone to sun damage.

If your horse has any of these conditions, or unpigmented areas on their face, they need the maximum defense provided by the UViator. It is also an excellent choice for horses living in environments with high glare, such as near water or in areas with consistent snow cover, where UV rays reflect off the ground and hit the eyes from multiple angles. For these owners, the peace of mind knowing their horse is fully protected is worth every penny.

How we conducted this comparison

To help you decide between these two levels of protection, we evaluated our flagship products based on several key criteria. Our testing process is rigorous and relies on both laboratory data and decades of field feedback from horse owners and veterinarians.

Here is what we looked for:

• UV Blocking Efficacy: We measured the percentage of harmful rays filtered by each material using spectrophotometry.

• Breathability: We tested the air permeability to ensure the horse stays cool. We use ASTM standards to verify that our 90% mesh maintains the same airflow as our 73% mesh.

• Durability: We assessed the tear resistance and longevity of the Textilene® mesh through abrasion testing and real-world pasture use.

• Functional Features: We looked at ease of use, including closure systems and hybrid capabilities that make daily management easier for owners.

Kensington's solutions: UViator CatchMask vs. Standard Protective

We offer two primary paths for equine eye protection. Both are built to last, but they serve different needs. We also provide a UViator Dartless Fly Mask for horses that need maximum UV protection without the traditional darted structure.

UViator CatchMask (90% UV)

This is our premium, medical-grade solution. It features our Solar Screen technology for maximum sun defense. The mesh is slightly denser than the standard version but retains the same high levels of visibility and airflow.

What truly sets it apart is our CatchMask® technology. The mask features a double-locking throat closure with a loop that allows you to clip a lead rope directly to the mask. It essentially turns the fly mask into a halter, making it perfect for horses that need 24/7 protection. You can lead, tie, or transport your horse without having to switch gear. This is a massive time-saver for owners of medical-needs horses who must remain masked at all times.

Standard Protective Fly Mask (73% UV)

This is the workhorse of our collection. It offers 73% protection and is lined with soft fleece to prevent chafing. It features the same double eye darts as the UViator to keep the mesh away from the eyes and ensure clear vision.

Both masks are available in multiple configurations, including options with ears, a long nose for muzzle protection, or an open-top design for horses that prefer their ears to be free. Choosing between these configurations depends on your horse's specific anatomy and preferences. For example, a horse with a white blaze and pink nose should always be in a "Long Nose" version to prevent painful sunburn on the muzzle.

Choosing the right protection for your horse's future

Bottom line? Which mask you need depends on your horse's specific health profile. There is no one-size-fits-all answer, but the data points toward a clear choice based on risk factors.

If you have a healthy horse with dark pigment, the 73% Standard Protective Fly Mask is a fantastic choice that will last for years. It provides the necessary balance of protection and value. But if you are managing a medical condition like uveitis or protecting a pink-skinned horse, the 90% UViator CatchMask is the investment your horse deserves. For more information on finding the right style, consult our comprehensive fly mask guide.

We always recommend consulting with your veterinarian if you have specific concerns about your horse's eye health. They can help you determine if 90% protection is a requirement for your horse's treatment plan. Early intervention is key to managing equine eye health and preventing the cumulative effects of UV damage.

Ready to find the perfect fit? You can explore our full 90% UV Blocking Collection or use our Kensington Size Guide to ensure your horse gets the comfort and protection they need.

Frequently Asked Questions

What is the actual difference between 73% UV blocking versus 90% UV blocking for our fly masks and which one does your horse need for healthy eyes?

The actual difference lies in the weave density and specialized Solar Screen technology. While 73% is ideal for healthy horses, 90% provides critical protection for those with medical conditions like uveitis or pink skin.

When considering the actual difference between 73% UV blocking versus 90% UV blocking for our fly masks and which one does your horse need, can they be worn at night?

Unless your horse has a medical condition requiring 24/7 protection, we recommend removing masks at night to allow the face to air out and prevent moisture buildup.

How do I clean the mesh to maintain the actual difference between 73% UV blocking versus 90% UV blocking for our fly masks and which one does your horse need?

You can hose off Textilene® masks or wash them with mild, equine-safe soap. Avoid harsh detergents that could degrade the PVC coating, and always air dry completely.

Does the actual difference between 73% UV blocking versus 90% UV blocking for our fly masks and which one does your horse need help prevent sunburn on the nose?

Yes, both protection levels are highly effective at preventing sunburn, but only if you choose a configuration with a 'Long Nose' to cover the sensitive muzzle area.

Will a mask that provides the actual difference between 73% UV blocking versus 90% UV blocking for our fly masks and which one does your horse need stay on a horse that rubs?

Kensington masks feature a double-locking hook and loop closure system that is much more secure than standard straps, helping the mask stay in place even for horses that rub.