From snowy trails to secret swimming holes, this hardy sized 20 oz Coffee Flask will keep you fully caffeinated every step of the way. And our professional grade stainless steel means there's never any flavor left behind or transferred to our next drink. TempShield insulation keeps beverages cold up to 24 hours and hot up to 12 hours. Durable 18/8 proGrade Stainless Steel construction. BPA Free and Phthalate Free.