As described in the main text, formation of the cuff relies on effects in controlled mechanical buckling. The fabrication began with spin-coating a precursor to PDMS (10:1 prepolymer/curing agent; 800 rpm for 60 s; Sylgard 184, Dow Corning) on a thin plate (1.5 mm) of polycarbonate (PC) followed by thermal curing. Corona treatment enabled bonding of a strip of PDMS (thickness, 100 μm; width, ~2 mm; length, 1 cm) formed in this way to another piece (thickness, 100 μm; width, ~1.5 mm; length, 3 cm) while under a state of prestrain. Releasing the prestrain led to the formation of a cylindrical shape.

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