Contour-Lock by RUGPADUSA is your solution for sliding or shifting rugs when you don’t want to add too much height. Contour-Lock will add slight cushioning underfoot and works especially well with runners and hall rugs where door clearance may be an issue. Dense 15oz/sq.yd. felt and 15oz natural rubber is heat-pressed and needle-punched to a compact but comfortable, 1/8" pile. Natural rubber provides a secure surface to stop slipping hazards while the heat pressed felt fibers lock with the rug's backing. Together, they keep rugs from shifting, bunching, or wrinkling. Contour-Lock catches dirt that falls through the rug to your floor’s finish. Our products are manufactured in the USA from the highest-quality, low-VOC materials with no adhesives, glues, PVC, or added chemicals. Contour-Lock is safe for your home & family, is mbdc cradle-to-cradle, cri Green label certified for air quality, and we contribute to leed (leadership in energy and environmental design) for low-emitting materials, innovation in design, and use of recycled content. Always follow your floor manufacturers recommendations for acceptable materials to use on your flooring surface. We back our products with a 10 year warranty!