Designed and developed by podiatric surgeon dr. kurt kaufman, d.p.m., facfas, drx insoles offer the comfort and support of a custom orthotic. each insole alleviates shoe-related foot pain including plantar fasciitis, morton's neuroma, bunions, knee pain and back strain. each style features ultron® single density polyurethane, which allows drx footbeds to last 3x's longer, and are more shock absorbent and supportive than standard insoles