All Active Hands gripping aids are made for tough use, whether that is in the gym or out and about. The looped aids have a stiff loop that allows independent use in the gym - the loops can be slipped over the end of gym equipment such as pull-down bars. The wrist strap is padded with neoprene for comfort and to prevent chaffing. They are a must for some hand-bikes, helping you to maintain a connection with the handles. Which size? Standard size fits a wrist circumference of 5.3"-7.2", large fits 7.1"-8.7". Items should arrive within 3-4 weeks. Items should arrive within 3-4 weeks.