SpareParts Tomboi vs Tomboii: How to Choose the Right Harness Size
By Cupid's Closet | Published: 2026-08-20
Category: Buying Guides
Confused between SpareParts Tomboi and Tomboii? This guide breaks down sizing, fit, and features to help you pick the perfect strap-on harness.
When it comes to strap-on play, the harness is the unsung hero. It determines comfort, stability, and how connected you feel to your partner. SpareParts, a beloved brand in the community, offers two popular models: the Tomboi and the Tomboii. Both are praised for their soft, breathable nylon fabric and secure fit, but they cater to slightly different body types and preferences. Choosing between them—and getting the size right—can make all the difference.
In this guide, we'll walk you through the key differences between the Tomboi and Tomboii, how to measure yourself for a perfect fit, and tips for adjusting your harness for maximum comfort. Whether you're new to strap-ons or looking to upgrade, this harness size guide will help you make an informed choice.
SpareParts Tomboi vs Tomboii: What's the Difference?
At first glance, the Tomboi and Tomboii look similar—both are made from the same soft, stretchy nylon and feature a minimalist, underwear-style design. However, the key difference lies in the leg opening and overall coverage. The Tomboi has a classic boy-short cut with a wider leg opening, while the Tomboii has a higher-cut leg line that provides more coverage and a snugger fit around the hips.
This means the Tomboi is ideal for those who prefer a more breathable, less restrictive feel, especially during longer wear. The Tomboii, on the other hand, offers a more secure, 'locked-in' sensation, which can be beneficial for vigorous play or for those who want extra support around the hips. Both models feature a removable, washable pad that holds the toy securely, and they're compatible with most dildos, including the Shaft Vibrating Model N: 8.5 in. Dual Density Silicone Dildo Oak and the Colours Stacked 6 in. Dildo Pink/Blue.

- Tomboi: wider leg opening, more breathable, classic boy-short style.
- Tomboii: higher-cut legs, more coverage, snugger fit around hips.
- Both are made from soft, stretchy nylon that's machine washable.
How to Measure for Your SpareParts Harness Size
Getting the right size is crucial for both comfort and functionality. SpareParts harnesses are designed to fit a range of body sizes, but they rely on your hip and waist measurements. To find your perfect fit, you'll need a flexible measuring tape. Measure around the widest part of your hips (usually at the fullest point of your buttocks) and around your waist (at the narrowest point, usually near your belly button). Write down both numbers in inches.
SpareParts provides a size chart that maps your measurements to their sizes (XS, S, M, L, XL, and 2XL). For example, the SpareParts Tomboi Rayon Brief Harness Black Size M is designed for hip measurements of approximately 38-42 inches. If you're between sizes, consider how you prefer your harness to fit: a snugger fit offers more stability, while a slightly looser fit allows for more breathability. Keep in mind that the nylon fabric has some stretch, so you can often size down if you're on the edge.
- Measure your hips and waist in inches using a flexible tape.
- Compare your measurements with SpareParts' size chart.
- If between sizes, consider your preferred fit: snug for stability, looser for breathability.
Tips for a Secure and Comfortable Fit
Once you've received your harness, it's important to adjust it properly. Both the Tomboi and Tomboii feature adjustable straps at the sides and a stretchy waistband, allowing you to fine-tune the fit. Start by putting on the harness like underwear, then adjust the side straps to ensure the pad sits snugly against your body. The pad should be positioned at the front, just above your pubic bone, to allow for optimal toy placement.
When inserting a dildo, make sure it's pushed all the way into the pad until it clicks or fits securely. You should be able to move and thrust without the toy shifting. If you're using a heavier or longer toy, like the Shaft Vibrating Model N: 8.5 in. Dual Density Silicone Dildo Oak, consider pairing it with the Tomboii for extra support. For lighter toys, the Tomboi is perfectly fine.
Remember to hand wash your harness in cold water and let it air dry to maintain its elasticity and shape. Avoid using fabric softeners, as they can break down the nylon fibers over time.
- Adjust side straps for a snug but not tight fit.
- Ensure the pad is positioned correctly before inserting the toy.
- Hand wash and air dry to extend the life of your harness.
Choosing between the SpareParts Tomboi and Tomboii ultimately comes down to your personal comfort and the type of play you enjoy. Both offer excellent quality, but the right size and fit are paramount. If you're ready to find your perfect match, explore the SpareParts Tomboi Rayon Brief Harness Black Size M and see how it feels. Your strap-on adventures will never be the same!



