I've only bought one so far, but I think it's great. Amazon: O'Neill Men's Hyperfreak 1.5mm Long Sleeve Top (~$100). It's hard to see in the pics, but there's an elastic line that goes around the waist, with a small cutout in the front to loop your boardshort laces through like others mentioned. The cost of this one was a bit of a splurge for me. I also tried on a cheaper lower end Rip Curl(~$60), which may have ended up being fine. But by comparison, the Oneill was so much easier to get in and out of, which I'm guessing could also mean easier paddling. It felt less bulky overall even though both were 1.5mm, and really comfortable. It worked great for me in SoCal summer temps. No regrets.