Advanced through years of design and proven concepts for demanding work situations. Knees have pleats to keep knee from stretching material when kneeling and are reinforced for heavy-duty with a specially designed material Phone Pocket: Wide phone compartment on hip Adjustable Hem with Drawstring Carry heavy hammers: Stiffened hammer loops on each side Tool/keys attachment point built-in utility pockets that can be tucked in when not in use Advanced design with fabric durability and much more.