Ergonomic design: The heart-shaped design with high sides and a low center is crafted to fit the curve of your knees and legs, allowing your back and hips to remain in a natural position while sleeping on the side. The hollow center increases air permeability. The elastic band helps keep the pillow in place, enabling you to sleep comfortably. High-quality material: The knee pillow is made of 100% premium memory foam that effectively cushions pressure from your legs and has excellent durability. After use, the pillow returns to its original shape. It is made of polyester fiber, the same material used in yoga mats - soft, breathable, and elastic. Detaching it at night can improve your sleep quality and rejuvenate you the next day. Simple cleaning - easy snap design, removable cover, durable, machine-washable. There's no need to clean the pillow's inner core. After use for 1-2 months, simply place it on a cool, ventilated area for 2-3 hours. Perfect gift: This knee pillow is ideal for pregnant women, people who sit for long periods, the elderly, and side-sleepers, or anyone needing to reduce leg pressure. It is also an ideal gift for parents, partners, and friends. It can provide you and your family and friends with better sleep quality and improve your quality of life.