Never wear cotton clothing if it's not at all treated with a fire retardant. Just these ski jacket, ski pants should 't be taken as a given as to tell the truth. They are also best with 100% cotton along with work on polyester. http://https//Listfav.com%2Fstory19394025%2Fthings-take-into-consideration-when-buying-women-s-ski-apparel-and-children-s/