I bought a Gill Men's Thermoskin Suit code# 4609. The retailer didn't have a size chart so I went to Gill's site for the chart. I'm 6' 2'' 215+lbs, 44'' chest, 36'' waist. According to the size chart I should be comfortable in an XL. I just now tried it on. It's too tight especially around the neck. It was restricting the blood to my brain. From now on I'm going to forego the size chart and stick with same size (XXL) as my other 2 wetsuits, Gul and DBX. Other than that the suit seems like it'll do nicely for winter sailing here in Northern California. The foot and hand openings were a little snug but they still stretched nicely enough to slip over them.