Dimensions on back of box: 1-3 (x-small) 34-40"/17-37 lbs. 4-5 (small) 37-48"/38-55 lbs. 6-8 (medium) 46-56 inches / 56-80 lbs. 10-12 (Large) 57-60 inches / 81-110 lbs. My very tall 4 year old is 43" tall with a 20" inseam. Size 4-5 (small) was difficult to put on, very tight fit. 6-8 (medium) suits her perfectly with some room to grow. I wash them in a mesh laundry bag (although hand washing is recommended) and let them air dry and have had no problems as these are very durable tights.
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