The KeepCup Helix Thermal Afterglow M from Keepcup is a double-walled stainless steel mug with a fully closable twist-fit lid. The double stopper mechanism seals the lid from both the bottom and top, which significantly reduces the possibility of spillage and improves user comfort when drinking on the go. The mug can keep warm for about one hour and cold for up to six hours, and is easy to disassemble and clean in normal use. The design is designed for easy handling: just turn it over and the lid is closed, it is released in the same way for a thorough wash. The double-layer stainless steel wall reduces heat transfer and the exterior remains pleasant to the touch. The M version is a universal size for both hand and holder in the car and will be appreciated by anyone who wants a practical reusable mug without complicated maintenance.