The ultimate protection against mosquitos and other flying insects! Features a fine No-See-Um Mesh made from 100% polyester. Flame retardant, lightweight and keeps you cool. Elasticized drawstring waist and cuffs. Zippered at the neck for easy access to the face. Jacket is unisex and sizes are measured by weight. Dont let those mosquitos "bug" you. Small fits up to 160 lbs.; Medium fits up to 200 lbs.; Large fits up to 240 lbs.; X-Large fits up to 300 lbs.