Bowtex makes under-garments that: protect against abrasion, impacts and heat you can slide under any pair of jeans or pants are comfortable to wear all day long, all year round let you keep an urban look. On and off the bike The base layer, which covers the whole legs (55% Kevlar, 25% Protex, 20% Cotton) protects against abrasion, impacts and heat and provides good temperature regulation for a high level of comfort. The added patches (100% Kevlar) on the bum, hips and knees will withstand several seconds on the asphalt! Bowtex is the only brand offering a 2 layer system, for enhanced protection. And last but not least, the leggings have built-in pockets so you can insert the D3O rated knee and hip protectors (sold seperately) The fabrics used in the products are designed to provide optimum comfor and protection and meet strict European norms. In winter, it s an added layer of thickness for extra heat. In hotter days, the fabric lets air flow through your legs to evacuate moisture and cool them. The black version (more expensive) is not simply dyed in black but manufactured using black Kevlar fibre. The products meet the following EU norms EN 12127:1997 EN ISO 13934-1:2013 EN ISO 12947-2:2007 EN ISO 15025:2003 EN 388:2003