The arm circumference is 1 millimeter. From the stomach to the thighs, it's 2 millimeters. Below the knees, it's 3 millimeters. This wetsuit is optimized for SUP. Also, it's easy to put on and take off with the chest zip, and there's no tightness from the zip on the shoulders and arms! The knee pads are also soft and easy to bend and stretch. It's a new item, only tried on with swimwear. I am 175 cm tall and weigh 65 kg, but the length was too short for me. I think it would fit someone between 160 cm and 170 cm tall. Stand Up Paddle