Those who are elderly, disabled or recovering from hip and knee surgery will find this toilet riser firm but not hard and warmer because of reflected body heat. It has easy hygiene access and no pressure points where the spine is concerned. Earth Throne Elevated Toilet Seat is one piece made from 100% EVA foam. Ethylene-vinyl acetate, is a closed-cell foam that compresses when sat upon, sealing to most toilet rims, allowing clients to sit confidently and safely while toileting without bolting or nasty screws to clean. Earth Throne releases when the person stands, allowing it to be removed easily to clean and take on vacation or remove when company comes. Doesn't leak! All fluids and solids are channeled into the toilet. EVA doesn't absorb odors if cleaned regularly. It's easy to clean and disinfect. No attachments needed and portable. DO NOT USE IF DEALING WITH BALANCE ISSUES.  This patented product is tested up to 400 lbs.