PRODUCT FEATURESRex Specs strap extenders are compatible with the XL, L, M and SW goggles. Strap extenders add 4 inches of length to the main strap.
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Measure the circumference of your dog's muzzle where you expect the goggle to land on their nose - usually around the back of their mouth.
Measure the head circumference where you expect the goggle to land on the forehead - typically an inch or so behind the eyes.