100% polyamide. Lightweight, waterproof jacket that packs down small, ideal for walking, hiking, camping, festivals and school trips. The seam sealed ISOLITE 5,000 polyamide fabric with a DWR (Durable Water ) finish sheds moisture and breathes. With two handy pockets and a small stuff sack. Regatta Kids Sizing (chest approx): 2 Years (21-21.5in), 3-4 Years (21.5-22.5in), 5-6 Years (23-24in), 7-8 Years (25-26in), 9-10 Years (27-28in), 11-12 Years (29.5-31), 32, 34.