This large ice pack features a self-absorbent polymer resin cloth cover that ships dry and absorbs water instantly upon soaking, drastically reducing package weight for easier transport and storage. The unique sub-box structure of this reusable cold wrap ensures even heat distribution, offering superior cold therapy compared to traditional gels. It forms a slushy texture in just 1 hour of refrigeration and fully freezes in 2 hours. The sub-box structure allows the hot cold compress therapy pack to be freely folded and tied up, making it lightweight and portable for outdoor use. Each independently frozen sub-box provides extended phase-change energy, maintaining cold temperatures for prolonged periods. This delivers deep cold therapy for sports injuries and muscle fatigue. Fully reusable, the cold & hot wrap can absorb water again after water evaporation, extending its lifespan and minimizing waste. Both inner and outer materials are environmentally friendly, using biodegradable polymer resin inside and specialized composite fabric outside.