100% polyester. Waterproof and breathable Isotex 5000 endurance stretch liner. Lightweight 2 way stretch polyester fabric. Durable water repellent finish. Articulated knee design. Taped seams. Part-elasticated waist with button adjustment system. Multi pocketed. Reflective trim. Regatta Kids Sizing (waist approx): 2 Years (52-53cm), 3-4 Years (53-54cm), 5-6 Years (55-57cm), 7-8 Years (58-60cm), 9-10 Years (61-64cm), 11-12 Years (65-67cm), 26" (68-70cm), 28" (70-72cm).