The 500ML Carry Mug Lid Thermal Mug with Straw is designed for simplicity and fashion, with a large caliber and detachable silicone ring. The concave cup bottom ensures a secure placement, made from 304 stainless steel. It comes in a straight cup shape with a vacuum insulated water bottle capability, and is made from durable and eco-friendly stainless steel materials. With a 12-24 hour thermal insulation performance, it is a portable and efficient option that meets CE / EU certification standards. Trust the BIERMOKK brand for expertly crafted vacuum flasks and thermoses.