SpareParts Theo Underwear Harness Black Size B Nylon

The SpareParts Theo Underwear Harness Black Size B Nylon is a powerful upgrade to the iconic Theo® harness, redesigned for even greater comfort, versatility, and discretion. Crafted to function as both everyday underwear and a premium strap-on harness, the SpareParts Theo Underwear Harness Black Size B Nylon offers unmatched stability and a sleek, second-skin feel that moves with your body.

This new Theo Cover edition features a sleek opaque cover, a low-profile elastic O-Ring, and a clear translucent logo for a more discreet look. The updated design includes three internal vibe pockets—two surrounding the O-Ring for mini vibes and a new, larger pocket in the lower pouch to accommodate bigger vibrators. An added interior security strap enhances support for packing and play, giving you superior hold, confidence, and custom fit.

The thong-style silhouette sits smoothly under clothing, while the lightweight nylon/spandex blend provides breathable, moisture-wicking comfort ideal for all-day wear. Corrosion-resistant brass snaps, adjustable thong straps, and a Velcro-secured extension belt allow you to tailor the fit effortlessly. The stretch O-Ring accommodates single or double attachments of various shapes and sizes, making this harness incredibly versatile.

Handcrafted in the USA with water-friendly, vegan-friendly materials, the SpareParts Theo Underwear Harness Black Size B Nylon delivers strength, beauty, and performance—perfect for packing, play, and everything in between.