Hot and Cool set These Hot and Cool set is a wonderful set to both your cold and warm drinks to take with you for example to your work or while traveling. The set consists a double-walled stainless steel bottle of 500ml to fill with your hot drinks and a bottle of single-walled aluminum 750ml to fill with your cold drinks. The double-walled stainless steel bottle is red in color and this bottle is printed with 'hot' so you know that you can ut the hot drinks in that one, the single-walled aluminum bottle is blue in color and is printed with 'cold' so you know this is the bottle for your cold drinks. You can also print th set with your own design or logo. You can print your design or logo in up to 4 colors. You can also engrave your logo. This set is a nice gift to give to your family, friends or colleagues. The bottles are BPA free production.