Serve chilled wine, fruit-infused water, cold brew, or cocktails with ease. A streamlined design, slim neck and signature S'well spout makes pouring a breeze. Featuring Therma-S'well™ technology - a triple-layered, vacuum-insulated construction made of high quality, 18/8, food-grade stainless steel walls plus a copper wall layer for superior temperature retention and a condensation free exterior. BPA and BPS Free. By choosing re-usable S'well products you can help reduce the use of single-use plastic products that pose a threat to our environment.