# Lemieux Size Guide - ArmourShield Pro Fly Masks

The **LeMieux ArmourShield Pro Fly Mask** is one of the most advanced equine fly masks available, combining a fine-mesh UV-protective shell with a soft, padded surround for all-day comfort. Available in both **Standard** and **Full** (with nose) styles, the ArmourShield Pro is designed to protect your horse or pony from flies, UV rays, and airborne irritants throughout the spring and summer season.

Use this size guide to find the correct fit for your horse before browsing our full range of [LeMieux ArmourShield Pro Fly Masks](/collections/lemieux-armourshield-pro-fly-masks). Getting the right size is essential — a mask that is too loose may slip or rub, while one that is too tight can cause discomfort around the eyes and ears.

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## How to Measure Your Horse

The size charts below reference three key measurements. Take these with a soft tape measure:

-   **A — Forehead width:** Measure across the widest point of the forehead, between the eyes.
-   **B — Face length:** Measure from the poll (top of the head) down to the bottom of the nose.
-   **C — Muzzle circumference:** Measure around the muzzle at its widest point (relevant for Full masks).

If your horse falls between sizes, we recommend sizing up for comfort. All measurements are approximate.

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## Standard Fly Mask

Size

Bridle Size

A

B

C

X-Small

Mini / Small Pony

28cm

47cm

44cm

Small

Pony

33cm

51cm

45cm

Medium

Cob

34cm

56cm

46cm

Large

Large Cob / Full

36cm

61cm

47cm

X-Large

Extra Full

39cm

65cm

49cm

All measurements are approximate.

![LeMieux ArmourShield Pro Standard Fly Mask size guide diagram](https://cdn.shopify.com/s/files/1/0225/4471/files/ArmourStandardMask_SizeGuide.jpg?v=1698142477)

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## Full Fly Mask (with Nose)

Size

Bridle Size

A

B

C

X-Small

Mini / Small Pony

28cm

47cm

44cm

Small

Pony

33cm

51cm

45cm

Medium

Cob

34cm

56cm

46cm

Large

Large Cob / Full

36cm

61cm

47cm

X-Large

X-Full

46cm

65cm

49cm

All measurements are approximate.

![LeMieux ArmourShield Pro Full Fly Mask size guide diagram](https://cdn.shopify.com/s/files/1/0225/4471/files/ArmourFullMask_SizeGuide.jpg?v=1698142467)

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## Frequently Asked Questions

### What is the difference between the Standard and Full ArmourShield Pro Fly Mask?

The **Standard** mask covers the eyes and ears only, whilst the **Full** mask extends down over the nose for additional protection against flies and UV exposure on the muzzle. Both styles use the same fine-mesh UV shell and padded surround.

### Is the ArmourShield Pro suitable for horses with sensitive skin?

Yes. The soft padded surround is designed to minimise rubbing, making it a popular choice for horses prone to skin sensitivity or sweet itch around the face.

### Can I use this size guide for other LeMieux fly masks?

This guide is specific to the ArmourShield Pro range. Sizing may vary across other LeMieux styles. Always check the individual product listing for size information.

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## Shop the Range

Ready to find the right mask for your horse? Browse our curated collections below:

-   [**LeMieux ArmourShield Pro Fly Masks**](/collections/lemieux-armourshield-pro-fly-masks) — the full ArmourShield Pro range in Standard and Full styles
-   [**Fly Rugs & Masks**](/collections/fly-rugs-masks) — our complete equine fly protection category, including rugs, masks, and leg wraps
-   [**LeMieux Spring/Summer 2026 Collection**](/collections/lemieux-spring-summer-2026-collection) — explore the latest seasonal arrivals from LeMieux

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> Source: [Pet n Pony](https://petnpony.co.uk/pages/lemieux-size-guide-armourshield-pro-fly-masks)