A0 will best fit athletes under 5'5", and under 130lbs
A1 will best fit athletes 5'5"-5'9" in height, and between 125lbs to 160lbs in weight
A1L will best fit athletes 5'7"- 5'10" in height, and between 125lbs to 160lbs in weight
A2L will best fit athletes 5'11" -6'2" in height, and between 160lbs to 190lbs in weight
This gi looks sharp like a diamond. Pants are light weight, don't stretch and feel very durable. The jacket is very comforting and clean. The emblems are all embroidered, only one small patch on the pants. The stitching at the edges all looks very tight. After one workout this is my favorite gi.