DuPont One Size Fits All Gray 18" Safespec 2.0 5.4 mil Tyvek FC Disposable Boot Cover With Elastic Closure (100 Per Case) DuPont One Size Fits All Gray 18" Safespec 2.0 5.4 mil Tyvek FC Disposable Boot Cover With Elastic Closure (100 Per Case) Skid-resistant materials for shoe/boot covers to prevent slipping Tyvek with friction coating 18" high boot cover with elastic top provides coverage up to calf Sole material composed of Tyvek FC