Features: Experience double hot/cold with the U shape neck warmer featuring explosionproof PVC and ergonomic design for full neck coverage, promoting relieving tension. Crafted from odorlessly, nontoxic polymer materials with extra wide mouth for easy filling, this hot water bottle bag combine safety with convenient portability for indoor/outdoor use. Designed for office workers combating neck strain, athletes recovering from workouts, and travelers seeking compact thermal relief solution during journeys. Use as a heat compress during winter desk work, a cooling pack after workouts, or relief companion on train and airplanes. The U shape structure securely to neck curves, delivering targeted temperature with reinforced stitching and leakproof closure for extended comfort. Specifications: Component: PVC Product Size: Approx. 35cm/13.78inch Color: 01/02/03/04 Package Includes: 1 PC U shape Hot Water Bag note: Please allow 0-1cm error due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color the item