Sorry for the late reply! This isn’t what I used, but it is white

LUBEMIDA EVA Foam Boat Flooring Sheet Marine Teak Decking, Embossed Mat with Adhesive for Yacht Surfboard,94.5"x35.4" https://www.amazon.com/dp/B08SWJ71JP/ref=cm_sw_r_cp_api_i_GEQQBCZX5G2J08RTTVDB