Skins are cosmetic enhancements for your weapons, that you can select from the loadout menu, to give your weapons a unique look.
You can purchase skin cases in the shop. Skin cases contain a random skin varying from tier 1 to tier 7, depending on the type of case that you purchase. When a case gives you a duplicate skin you’ll be compensated with blue tokens or event tokens that you can use to buy skins directly from the loadout menu. Skins are also available to be purchased directly from the store with credits when they are on offer as a flash sale.