This is a brilliant jersey. I ordered medium. I’m 6ft tall, 41” chest and 32” waist. It fits snugly, but not race-fit tight. I have room for a winter base layer underneath, but I’ve worn it by itself so far. I’ve been riding in Yorkshire weather around the 5-10 Celsius mark. On the climbs, I’ve warmed up a bit but the back and sides breathe really well so I’ve not overheated like I would’ve if I was wearing a jersey made of thermal fabric all over. On windy moor tops and descents the windproof fabric on the front works great, helping me keep an optimum temperature. The cuffs are lovely and soft and stretch nicely over the cuffs of my gloves and the sleeves are just the right length for me. The zips have sensibly sized tabs so you can find them with gloves and the high collar is great to keep the draught out. I think it will be my go-to jersey for spring/autumn and riding later in the evening when it’s cooled off. Pockets feel secure and stretch well. Recommended.