Heavyweight 311gsm cotton drill All DNC garments use the Green Dye only, except for the Patrol Saint Flame Retardant range. All DNC garment fabric fully complies with Oeko-Tex standard 100 class II for products with direct contact to the skin in which prohibited to use aromatic amines, sensitizing dyes and cancer risk dyes. Green dye should meet the following conditions: Does not contain harmful or nonaromatic amine; dye itself, non-carcinogenic, sensitization, acute toxicity; the use of formaldehyde and, after extraction of heavy metals in the following limits; non-environmental hormone; nonpersistent organic pollutants; does not produce pollution of the environment harmful chemicals; not produce chemicals that pollute the environment; color fastness and superior to disable the use of dyes. Double layer knee. Tool and phone pockets lower leg. Metal press studs. Sun Protection