Soles of Tumbling (3.5e Equipment)
From D&D Wiki
Soles of Tumbling: This item resembles a pair of lay-in soles that can be put inside a pair of shoes or boots. When worn, they bestow upon the user a competence bonus to Tumble checks equal to the soles' enhancement bonus.
Weak transmutation;CL Varies; Craft Wondrous Item, cat's grace. Caster level must be at least equal to the soles' enhancement bonus.; Cost 800 gp (+2), 3,200 gp (+4), 7,200 gp (+6), 12,800 gp (+8), 20,000 gp (+10).; Activation: —; Weight: 0.5 lb.; Market Price: Varies