Cirrus Tyvek Lightweight Catalog Envelope, White, Box of 100: * DuPont lightweight Tyvek * Moisture resistant, yet light as a cloud in weight * Security of its contents is enhanced by an inside printed tint pattern * Convenient Redi-Strip closure that requires no moisture to seal * Removable strip provides a clean, quick seal immediately upon contact * Peel-off strip protects the adhesive from dust for longer shelf life * Treated with an antimicrobial agent to protect it from the growth of bacteria, mold, mildew, fungus and odors