SpareParts Tomboii Black/Red Nylon

The SpareParts Tomboii Harness Briefs are a seamless slip-on alternative to traditional strap harnesses, designed to deliver body-hugging support without a single buckle, strap, or adjustment in sight. Made from a soft 85% Lenzing Modal (Rayon) and 15% Spandex blend, the brief conforms to your curves and stays firmly in place through every movement. Three internal bullet pockets let you layer vibration directly into the experience, while two reinforced O-ring slots — each accommodating dildo diameters from 1.25" to 2.25" — open up options for angled play or double penetration. A built-in packing strap across the shaft keeps things stable for pack-and-play sessions, and a discreet condom pouch keeps protection within reach. Available in sizes XS through 3X, with SpareParts recommending sizing up if you fall between measurements.

Tomboii Harness Briefs features:

• Slip-on brief style: No straps, buckles, or adjustments — slides on like underwear for quick, fuss-free wear.
• Material: 85% Lenzing Modal (Rayon), 15% Spandex — soft, breathable, and body-conforming.
• 3 internal bullet pockets: Hold bullet vibrators (not included) for added stimulation during wear.
• 2 reinforced O-ring openings: Compatible with dildos and vibrators from 1.25" to 2.25" in diameter; supports angled play or double penetration.
• Built-in packing strap: Secures shaft for pack-and-play functionality and prolonged wear.
• Condom pouch: Integrated pocket keeps a condom on hand for safe, spontaneous use.
• Inclusive sizing: Available in XS through 3X to fit low waist measurements from 26" to 52".

Specifications / Size & material

• Material: 85% Lenzing Modal (Rayon), 15% Spandex
• Body-safe note: Modal is a soft, breathable, skin-friendly fabric widely considered body-safe for external wear.
• O-ring diameter: 1.25" – 2.25" (both slots, all sizes)
• Size XS: Low waist 26" – 28"
• Size S: Low waist 29" – 32"
• Size M: Low waist 33" – 37"
• Size L: Low waist 38" – 40"
• Size XL: Low waist 41" – 44"
• Size 2X: Low waist 45" – 48"
• Size 3X: Low waist 49" – 52"
• Sizing note: Order one size up if you are between sizes.
• Color: Black/Red
• Brand: SpareParts

Intensity & Experience Level

Level: Beginner — Sensation: Restrictive / Wearable Support

The Tomboii is one of the most forgiving harness styles available — if you can pull on a pair of briefs, you can wear this harness. The slip-on design removes the learning curve of traditional strap systems, making it ideal for first-time harness users and anyone who finds buckled harnesses physically challenging.

Who is this product for?

• First-time harness wearers: Anyone who wants the functionality of a strap-on harness without the complexity of straps, rings, and buckles.
• Gender-affirming users: People exploring packing, pack-and-play, or gender expression who want a discreet brief-style option that feels natural to wear.
• Toy collectors: Users with an existing dildo or vibrator collection who need a versatile harness compatible with multiple toy sizes and penetration angles.
• People with limited dexterity or joint flexibility: Those who struggle with traditional harness buckles will appreciate the simple pull-on fit that requires minimal hand and wrist movement.
• Partners seeking added stimulation: Anyone who wants to incorporate bullet vibrators into harness play for shared or solo sensation.

How to use the Tomboii Harness Briefs?

1. Choose your toy: Select a dildo or strap-on vibrator with a base diameter compatible with the 1.25" to 2.25" O-ring slots. A flared base or suction-cup base adds extra stability.
2. Insert your toy: Thread the toy through one of the two reinforced O-ring openings. Choose the slot angle that suits your intended play style — standard penetration or double penetration.
3. Slide on the harness: Pull the Tomboii on like a pair of snug underwear. The modal-spandex blend will conform to your body and hold the toy securely in position.
4. Load your bullets (optional): Place bullet vibrators into the three internal pockets for added vibration during wear. Turn them on before sliding into the briefs for easier access.
5. Attach packing strap if needed: For pack-and-play use or extra shaft stability, secure the built-in packing strap across the toy.
6. Comfort checkpoint: Before bringing in a partner, wear the harness solo with your toy in a relaxed setting. Check that the fit feels secure, the O-ring holds the toy without excessive movement, and you are comfortable with positioning.
7. Adjust or stop: If the harness feels too loose, too tight, or the toy shifts during use, stop and readjust. Simply slide the briefs down to reposition the toy or remove the harness entirely — no tools or buckles required.

Techniques & ways to play

• Solo pack-and-play: Wear the Tomboii with a packing dildo for gender-affirming expression throughout the day, then transition seamlessly into play without changing harnesses.
• Standing face-to-face: Ideal for mirror play or intimate make-outs that transition into penetration — the brief style holds its position upright with ease.
• Doggy style: Strong thrust control and internal support make this a great angle for deeper, more powerful movement.
• Riding / Cowboy / Cowgirl: Let your partner control rhythm from on top while the harness keeps the toy firmly anchored beneath them.
• Double penetration play: Use both O-ring slots simultaneously with two compatible toys for added fullness and sensation.
• Dom/sub dynamics: The wearer naturally holds positional control, while the receiving partner can guide pace and depth. Establish boundaries, safe words, and consent for any escalation — including introducing the second O-ring slot or increasing vibration intensity — before play begins.

Pairs well with / Complete the scene

• Strap-on dildos: Any dildo with a base diameter between 1.25" and 2.25" is compatible with the Tomboii O-ring slots.
• Strap-on vibrators: Vibrating dildos designed for harness use pair seamlessly with this brief.
• Bullet vibrators: Up to three bullets (not included) can be loaded into the internal pockets for layered stimulation.
• Condoms: Use the integrated condom pouch to keep protection on hand during play.
• Water-based lubricant: Recommended as a universal-safe option for use with paired toys; apply sparingly to avoid saturation of fabric seams.
• Collections: SpareParts Harness Collection; Gender-Affirming Play Collection.

How to clean and care for the Tomboii Harness Briefs

• Washing: Machine-wash on cold inside a garment bag, or hand wash gently for longest fabric life. Wash before first use to remove any manufacturing residue.
• Drying: Air dry flat or line dry. Do not tumble dry — heat will degrade the spandex elasticity and distort the shape of the O-ring openings.
• Lubricant compatibility: The harness itself is not insertable. Use a lubricant appropriate for your paired toy — water-based lube is a universally safe choice and is least likely to saturate fabric seams.
• Storage: Fold and store in a drawer or breathable fabric bag. If storing dildos inside the O-ring slots or bullet pockets, keep silicone toys separated from each other to prevent material degradation.

Additional information

• Versatility: Built for penetrative play, pack-and-play use, and gender-affirming wear — transitions smoothly between all three without requiring a harness change.
• Support: Full-brief construction keeps toys stable across a wide range of movements, positions, and thrust intensities.
• Accessibility: The pull-on design requires no fine motor skill for buckles or straps, making it particularly suitable for users with limited hand dexterity, joint flexibility challenges, or arm and hand mobility limitations.
• Erectile support: May be suitable for individuals who experience difficulty maintaining an erection, premature ejaculation, or erectile dysfunction, as it enables penetrative sex using a strap-on dildo independent of erection.
• Layering tip: Wearing boxer briefs underneath can provide extra support for heavier dildos or prolonged session use.

Special considerations / warnings

• Mobility requirement: Putting on and removing the Tomboii requires enough lower-body mobility to step into and pull up a pair of briefs. Users with significant lower-body mobility limitations should consider whether this style is appropriate for their needs.
• Toy flared base: Always use a dildo with a flared base or suction-cup base inside the O-ring slots to prevent unintended slippage during use.
• Lube and fabric: Avoid applying excess lubricant directly onto the fabric — saturated seams can weaken over time. Apply lube to the toy itself rather than the harness.
• Bullets not included: Bullet vibrators are sold separately. Ensure any bullets used fit securely within the internal pockets before vigorous activity.
• Wash before first use: New fabric garments may carry residue from manufacturing processes.
• Not a medical device: The Tomboii is an adult pleasure and gender-affirming wearable. It is not a medical device and does not treat, diagnose, or cure any condition.

18+ only. For consensual adult use.