Low glass transition temperature polymers

I am looking for a thermoplastic polymer with a low glass transition temperature. I would like to use the material in a custom-fit device for an arm or leg. Ideally, the material would become soft at a low temperature and be safe to handle while fitting to a person's arm or leg. I believe Polycaprolactone has a low enough melting point. Products that use Polycaprolactone are craft materials like "Friendly Plastic" (R). Does anyone have experience using Polycaprolactone in other applications? What other materials would you suggest?