Single and double coated fabric

Single-coated fabric has the TPU layer on one side only, double-coated fabric on both. That matters for repairs.

Floors are often double-coated, tubes single-coated to save weight (as on the MRS Nomad). Self-adhesive tapes stick best to coated surfaces. On the uncoated inside, tapes like Tenacious Tape or duct tape hold better. For single-coated fabric, Alpacka recommends backing tears from inside.