Ikea Rug Underlay Pad with Anti Slip Carpet Stopp Filt 2 X 4' Felt Underlayment Rug underlayment helps stop your rugs from sliding around underfoot Holds your rugs in place - easier to walk on or vacuum Place under your rug for safety. Actual measurement 2'2" x 4'1" Helps stop your rug from sliding on most any surface - tile, wood, vinyl, cement Adds a layer of insulation between rug and cold floor