Fly sheet provides a horse with a comforting barrier of protection against flies and other nuisance insects. While all fly sheets for horses are made of open weave mesh for breathability in hot, buggy conditions, some feature treated materials that also shield the horse’s hair and skin from damaging, coat-fading UV rays. Use of a fly sheet can make a horse’s time in turnout more enjoyable, and most importantly, it can help reduce stress, panic or pacing in horses that are especially sensitive to insects.