Constructed of durable spunbond polypropylene material with non-skid, non-conductive soles. Skid-resistant pattern improves friction and traction. Strong elastic band around ankle allows for a universal fit. Full-length toe to heel conductive strip, stitched both inside and out for length of entire bootie. Intended to be worn over ESD shoes. One size fits most (up to men’s size 15). Approved for Class 100 & Class 5 Cleanroom use per Federal Standard 209E and ISO STD. 14664-1 Class 5. For use with Large and Small Kinetic BootieButler Dispensers.