Silica gel in the top band Pull On closure Hand Wash Only (See the 4th image for the size chart) These maternity compression medical stockings are made of premium quality 1280D grade microfiber material, breathable and durable compression fabric composed of 77% nylon and 23% spandex. Features true graduated compression of 20–30 mmHg. Anti-fatigue, sweat-absorbent, anti-odor, anti-slip, breathable, and eco-friendly. The socks may feel tight when first worn; this is normal. By improving blood flow and circulation, maternity compression socks may help reduce ankle, leg, and foot swelling commonly associated with pregnancy. Thigh-high compression stockings also help reduce muscle cramping and re-energize tired legs, making them suitable for individuals who stand or maintain a seated or standing posture for extended periods. They may also help reduce the risk of developing varicose veins, helping you feel and look comfortable. For optimal performance, it is recommended to have two pairs for rotation. Socks should be washed every two days, not exceeding three days of continuous wear, as prolonged use may affect elasticity recovery. We guarantee the socks will maintain effective compression and durability for dozens of washes.