Finding the right wetsuit size is the single most important step in getting the most out of your suit. A proper fit can make or break your time in the water — too loose and water will flush through, leaving you cold and uncomfortable, too tight and you’ll feel restricted.

Every brand’s sizing is a little different, so don’t rely on your “usual size.” Instead, follow the specific size chart for the wetsuit brand you’re looking at, and take your own measurements to be sure.

Pro tip: if you’re between sizes, it’s usually better to size down for a snugger fit. Wetsuits are designed to stretch and contour to your body, and a closer fit will keep you warmer.