Cordura® fibre in the sole will give these socks exceptional longevity. They have been tested in real conditions at ENSA over hundreds of kilometres and are guaranteed against holes in the heel and toes for 2,000 km/two years (whichever comes first). Ultra-fine–Ultra-lightweight. Suited to hiking. Certified STANDARD 100 by OEKO-TEX®N° 1105067.0, CENTROCOT.