【Anti-Gravity Full-Enveloping Design】The procellatech sleep pillow features a fully enveloping design, tested for resilience by Japan's JQA. It seamlessly conforms to your waist, filling the gap between your lower back and the mattress to distribute pressure during sleep. This maintains your spine's natural S-curve, ensuring effortless, comfortable, and pressure-free rest every night 【Dynamic Contouring】Engineered with ergonomic zoning and refined over three years of design improvements, it achieves perfect dynamic contouring. No matter how you move during sleep, it stays snugly aligned with your waist without any pressure points. At any time, in any position, it fully releases pressure on your lower back, delivering superior sleep comfort 【Stretchable】This procellatech sleep pillow features Velcro fasteners at both ends, allowing you to adjust the tightness to perfectly contour to your waist and accommodate a wider range of waist sizes 【Comfortable and breathable Fabric】This sleep pillow features Jingbingji fabric fibers that stay cool and breathable, wicking away sweat without stickiness. Soft and plush against the skin with slow rebound, it perfectly contours to your waist 【Do Not Machine Wash】Soak for ten minutes in cold water below 86°F (30°C) or a mild household shampoo or body wash (do not soak for extended periods). 2. Gently press during soaking; do not wring forcefully. 3. After washing, gently press out excess water or use a towel to absorb moisture (do not wring dry). 4. Lay flat to dry after reshaping (do not hang in direct sunlight; do not use steam irons) lumbar pillow for sleeping