Beeswift Heat Pack FleeceInfo Sure Thermal Soothing Heat Packs feature a natural palygorskite bead filling, offering a hygienic and long lasting alternative to traditional wheat based products. This natural thermal solution is ideal for regular microwave heating and cooling cycles, providing consistent comfort and relief. The range includes shaped back and neck warmers for targeted comfort, carefully manufactured to comply with BS8433: 2004 (Microwaveable Personal Warmers).