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SpareParts Theo Strap On Harness

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Theo from SpareParts Hardwear is a beautiful and seductive thong harness. Comfortable to wear with an adjustable thong strap and belt, this strap on harness is sure to please. Fashioned from lightweight Nylon and Spandex, Theo is ruggedly imposing but soft and luscious! Its sturdy belt fastens with Velcro and includes an elastic pull that locks your product in place, giving you the security and ultimate control that you desire. 

Spareparts Theo with Dildo

The incredibly durable and flexible O-ring is made of elastic and accommodates an array of attachments including single and double dildos. Switching toys during sex is easy, simply slide out one toy and replace with another. The hand-crafted thong harness sports two inner mini-vibe pockets (vibes not included) above and below the O-ring allowing for sensual vibrations through your toy when vibes are in place. Mini-vibes can be turned on or off through the fabric so there is no interruption in play.

Dangerously gorgeous Theo is extremely well made and durable, allowing you countless romps of erotic pleasure! Made from top-of-the-line, breathable fabric, moisture is wicked away from the body when things heat up. This sizzling and sultry harness is suitable for extended wear, so when the time arrives…you are ready for action!

Spareparts Theo Harness Back View

Wash your harness before first use and after each use either by hand or machine (preferably in a launder bag). If washing by machine, use the gentle cycle. May line dry, lay flat or tumble dry on low temperature.


Theo from SpareParts HardWear Specs

  • Seductive hand-crafted thong style strap on harness
  • Single thong strap gives you total control over your dildo
  • Lightweight, hygienic and comfortable to wear
  • Adjustable thong and belt
  • Stretchable elastic O-ring fits dildos of different shapes and sizes
  • Works with single and double dildos
  • Two inner pockets above and below O-ring accommodate mini bullet vibes (mini-vibes not included)
  • Belt secured with Velcro and has second elastic pull that locks product in place
  • Easy to reach condom pocket
  • Can be worn for an extended period
  • Washable
  • Travel friendly
  • Colors: Classic Black and Rose Pink


  • Thong style harness
  • Satin pouch to store your harness
  • 1 Year Warranty

Spareparts Theo Harness in Box

How to Wash SpareParts Theo?

  • Hand or machine washable and completely hygienic
  • Hand wash or machine wash on gentle cycle. If machine washing use launder bag.
  • Line dry, lay flat, or tumble dry on low temperature
  • Wash before first use.


  • Lightweight
  • Breathable fabric suitable for extended wear
  • High quality Nylon/spandex/Velcro
  • Wicking elements draw moisture away from body
  • Corrosion resistant brass snaps with Pearlescent accents
  • New tagless labels

Spareparts Theo Harness Pink with Storage Bag

Size chart

Size                        Belt                                        Thong Strap

Size A                    20-50 inches                       13-18 inches

Size B                    35-65 inches                       21.5-27 inches

Diameter across O-ring opening (for Dildo) 1.25-2 inches in both sizes

Circumference of O-ring opening (for Dildo) 3.92-6.28 inches in both sizes

Which size Theo is for you?

Start with measuring for the perfect fit. For Theo™ you will need to consider Belt measurements (hips), groin measurements to determine which Theo™ will produce the best fit for you, or your partner.

Size A or Size B

Follow these simple steps to determine which Theo™ product will fit you perfectly! To determine if you or your partner is a size A or B, you will need to consider both the Belt and thong strap measurements.

Measuring for the belt

Step one
To measure which size is best for the wearer; first consider where you will be wearing it whether it’s on your waist (high ride) or on your hips (low ride). If you prefer to wear your harness high, instead of low (please be aware many wearers like to wear their harness low as they want it to sit on their clitoris so it allows for stimulation where ever possible); measure around your waist instead of your hips.
Step two
Wrap the measuring tape around your hips (or waist if applicable), where you would wear your belt. Take the number where the tape measure completes and crosses over itself.  You should add a few (3-4) inches to this measurement for size fluctuation and room for sizing adjustment.  Take the measurement and see size chart above for Belt and determine which belt would be best.  
(You should be able to select a size that is reflective of your belt size.  So for example:  if you wear a size 32 belt, and it has a good fit with a couple holes for adjustment, you should select the Joque that best fits 32 inches).

 Measuring for the thong strap

Step one
To measure which size is best for the wearer; first figure out where you will be wearing it on your hips (or waist if applicable).  The best way to do this is to put on a regular belt, as this will help you to have a place to start and finish measurement on the next step.
Step two
Next you should take your tape measure and start by taking the end of it and holding it in the center of the belt (in line with your belly button).  Slide the measuring tape between your legs.  You want to stretch the measuring tape straight and taught to the center of the back of the belt (around where your tail bone is).  
Take the measurement, and then subtract 7 inches, this should give you the length of leg strap you need for the harness to fit securely but still be comfortable. See size chart above for Thong Strap.