SIZE CHART:order a size up would be recommend S: bust 54cm, waist 50cm, hips 60cm, suitable for height 95-105cm M:bust 58cm, waist 54cm, hips 64cm, suitable for height 105-115cm L:bust 62cm, waist 58cm, hips 68cm, suitable for height 115-125cm XL:bust 66cm, waist 64cm, hips 74cm, suitable for height 125-135cm XXL:bust 70cm, waist 68cm, hips 80cm, suitable for height 135-145cm 2.5mm Thickness Wetsuit- Make of stretchy 2.5mm Neoprene, keep kids warm enough and allows for good easy movement. Functions- UV protection (UPF 50+), Quick Dry, and anti-plankton, and keep kids warm in the ocean or pool. Durable & Seamless-Flat-lock stitched seams lay flat to eliminate bulk and prevent chafing while strengthening seams for added durability, and hold up to the wear and tear that comes with all water sports. Multi-use Swim suits-Toddler Colorful wet suit is great for swimming, diving and other water sports. Full body wetsuit is suitable for all seasons. Kids' Wetsuits are supposed to fit a bit tight like a second skin so that the water will not creep in.