Polyurethane cover is: Anti-mites, antibacterial, antifungal, anti-odor, anti-stain, breathable, fireproof, waterproof, soft and washable. PREVENTS POSSIBLE INFECTIONS: The gel wheelchair cushion features a polyurethane cover that is antibacterial, anti-mites and anti-fungal. It prevents growth of organisms that could potentially harm the user. The material is also anti-odor an anti-stain, which is helpful in preventing possible infections. HIGH QUALITY MATERIAL: The filling of this cushion is made up of a generous layer of high grade, premium supporting silicone gel, which is incredibly soft and supporting, molding to your body shape instead of bulking under it. The gel cushion easily distributes the pressure uniformly throughout the base of the cushion. WATERPROOF: The gel wheelchair cushion has a polyurethane cover that is waterproof for easy cleaning, breaths well, and has high flexibility and strength as well as being soft to touch. COMFORTABLE: This cushion provides the utmost comfort to the user with its brilliant innovation, the silicone gel-filling. The neutral gel properties prevents heat build-up during use and keeps the body cool. The outer fabric is soft and breathable, prevents friction and pressure sores, and gives high level of support to the body. DURABILITY: The gel cushion is made of premium quality that it retains its good quality and shape and does not permanently deform when used for long term. It always regains its supporting shape after prolonged usage.