Tri-Max triple insulation for superior performance, keeps cold drinks cold for 36 hours and hot drinks hot for 8 hours. Stainless Steel leak proof top with wide mouth for easy filling and small mouth for easy drinking/pouring. Interchangeable with flip spout top. Removable stainless steel tea, fruit, ice strainer. Boulder comes in 20 & 24 ounce sizes. Great for Gardeners! Fits in most cup holders and bike cages. BPA Free. 18/8 Stainless Steel. Choose from pull down menu.