Tuga Jammers are constructed with the same high quality fabrics and stitching as the rest of the Tuga line. These stylish swim shorts have flat seams with rubber elastic waist and legs to assure maximum comfort and performance. They are UPF 50+ for the highest in UV protection. The front is lined with soft helinica lining and elastic edging to assure the most support. The internal flat tie string assures you can get the right fit. Jammers sizing is based on waist partially stretched. SIZING: 2yr (18-24'' waist range), 3yr (19-25'' waist range), 4yr (20-26'' waist range), 5yr (21-27'' waist range), 6yr (22-28'' waist range), Small (22.5-28.5'' waist range), Medium (23-29" waist range), Large (24-30'' waist range), XL (25-31'' waist range), 2XL (27-33'' waist range), & 3XL (29-34'' waist range). Please email us or call us if you have any questions, just click on "See Merchant's Size Charts'' under COLOR selection, from there click on the "SELLER HELP" tab.