----Ideal for football, baseball, soccer, golf and other outdoor activities ----Cover fabrics are made with a durable material that is wind and water resistant (cover: 100% nylon / liner: 100% polyester) ----Zippered inside hanging pocket holds heat pack securely ----Unique insulation reflects natural body heat for warmth and comfort ----Use with heat packs in extreme cold conditions ----Knit cuffs keep warmth inside ----Adjustable and reinforced waist strap fits most sizes ----Compact and lightweight