The boy's compression legging goes great underneath loose shorts when soccer season, winter wear when skiing, ice skating, hockey, tubing, snowboarding, basically any winter activity. Also these goes great underneath school clothes on those freezing cold days. These make great layering items because of their soft and lightweight interlocking fabric.Sizei InfoSize 5 :Height 45"-47" Weight 42lbs-46lbsSize 7:Height 50"-52" Weight 53lbs-58lbsSize 10:Height 54"-57" Weight 60lbs-77lbsSize 12: Height 58"-60" Weight 79lbs-88lbs