Bowtex makes under-garments that: protect against abrasion, impacts & 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 & off the bike The base layer, which covers the whole legs (55% Kevlar, 25% Protex, 20% Cotton) protects against abrasion, impacts & heat & provides good temperature regulation for a high level of comfort. The added patches (100% Kevlar) on the bum, hips & knees will withstand several seconds on the asphalt! Bowtex is the only brand offering a 2 layer system, for enhanced protection. & last but not least, the leggings have built-in pockets so you can insert the D3O rated knee & hip protectors (sold seperately) The fabrics used in the products are designed to provide optimum comfor & protection & 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 & 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