The Hydro Flask 24oz Mug slides shut to tame splashes and trap temperatures, then slides open wide enough to fit straws. It has a comfy, soft finish that makes it cozy to hold and sip. Features include TempShield insulation that keeps beverages cold or hot for hours, a closeable lid to keep splashes at bay, and a durable design to withstand daily use. Made from durable 18/8 Pro-Grade Stainless Steel, it's BPA-Free and Phthalate-Free. The mug is designed for daily use and is suitable for both men and women.