One size fits most; 3 pound set one and a half pound per side (933); 5 pound set two and a half pound per side (935); 7.5 pound set 3.75 lbs. per side (937); 10 pound set 5 lbs. per side (940); Made of neoprene with adjustable straps with clips; Cushioned and comfortable; Great for vertical traction in the water and on the land