Like New Filled with lightweight, 100% recycled body insulation, the Baby ThermoBall™ One-Piece is the ideal all-in-one layer for their first few winters. With an attached hood, fold-over mitts and booties, plus a water-repellent finish, they’ll have the coverage they need for new adventures in the outdoors. We’ve updated our youth sizing. Please use our sizing guide to find your best fit.