Im 5’5, 150 pounds, athletic build., oredered size large which is the correct size 3.5mm . Have a built upper body so suit is tricky to get into being its new. Gurrands over time it will wear and stretch and be easier to get in. Great suit, great materials, keeps me warm in 4 plus hour dives. Hope it lasts a long time, thanks Venture wetsuits 🤙🏼