burton gore-tex® mittens for kids. the burton gore-tex® mittens for kids combine professional features with kid-friendly fit and functionality. the waterproof and breathable gore-tex® membrane, combined with dryride ultrashellâ„¢ 2l fabric and thermacore® insulation, keeps hands warm and dry even in the most adverse conditions.in addition, pvc-free materials are used in the manufacturing process, which means that burton is not only protecting your child, but also the environment.