extreme black grey size:EU 27 The flex grooves in the

The flex grooves in the outsole promote natural flexibility

Built-in underpants add extra coverage and support

Blacc gym ball in durable PVC

so they're both warm and soft

Temperature regulating t-shirt

extreme black grey size:EU 27 The flex grooves in theExtreme is a warm thermal boot with award winning design and many smart details a favorite for both children and parents. Thanks to the design of polyurethane with adjustable cuff, Extreme is waterproof, lightweight and comfortable enough to wear all day. The boot is made of a flexible polyurethane material called Elastopan and is a 100% PVC free, degradable material that contains millions of tiny air bubbles and is 40% lighter than PVC and rubber.