Jaybird & Mais 50-Blue 50 Foam Underwrap/Pre-Wrap: 2-3/4 X 30 Yd, BlueJaybird & Mais 50 Foam Underwrap has a thin polyurethane foam substrate that is strong and highly porous. Non-adhesive foam underwrap or pre-wrap tape is used directly on the skin as a base under adhesive sports medicine tapes to aid with painless tape removal and to prevent tape..