Tundra Seal. Flexible and easy-to-apply tubing for hot and cold water pipes or in-floor radiant heat. Improves energy efficiency. Superior to open slit insulation with no freeze-up exposure potential. Reduces condensation and plumbing noise. No need to tape or glue. Fully sealed to prevent heat loss. Easily remove raised adhesive release liners from either end of the pipe insulation length and squeeze slit shut along entire length. Flame-retardant closed cell polyethylene construction.