Vac-U-Lock Dual Density Ultraskyn Colors Set by Doc Johnson

Three interchangeable Ultraskyn attachments lock into a universal harness for quick-change strap-on play. Dual-density material warms to body temperature, delivering realistic sensations with progressive grip intensities. Perfect for couples wanting variety and hands-free versatility.

What it does

Vac-U-Lock's patented suction-cup attachment system revolutionises strap-on play. Press each attachment firmly into the universal harness until you hear the click—the connection locks securely without fumbling with straps or rings. Three distinct attachments let you escalate sensations throughout your session or experiment with different sizes to find what works best for both partners.

Ultraskyn dual-density material mimics natural feel by combining a soft outer layer that compresses under pressure with a firm inner core for structural support. As the material warms to body temperature during use, textures become more pronounced, creating escalating grip sensations that respond to every thrust and movement. Extender Kits For Penis Growth offer a different approach for those seeking length or girth enhancement rather than strap-on versatility. Generous lube transforms entry from challenging to comfortable, so apply it to both the attachment and target areas before play.

Specifications

• Attachment system: Advanced Vac-U-Lock with patented suction cup base
• Material: Dual-density Ultraskyn (soft outer, firm inner core)
• Attachments included: 8" pink realistic dong, 7" blue cock, 7" purple slim cock
• Harness: Adjustable universal fit, accommodates up to 69 inches
• Care: Clean with included toy cleaner, maintain with refresh powder

Fit and sizing

Measure your harness size by wrapping a soft tape around your body at the point where you'll wear it—usually the hips or upper thigh, depending on your preference. Adjust the harness to sit comfortably without pinching or sliding. At Cockringshop, we specialise in products for men and couples, and we know that comfort matters as much as sensation. Start with the 7" purple slim attachment if you're newer to strap-on play, then progress to the blue or pink options as you build confidence. Experienced users often go straight to the 8" realistic attachment. Choose based on what feels good for both partners, not on ego—the three-attachment set lets you change your mind mid-session anyway.

How to use it

Adjust the harness to your preferred fit before selecting your first attachment. Press each attachment firmly into the Vac-U-Lock plug until you hear the click—this secure connection prevents slipping during vigorous activity. Apply lube generously to both the attachment and target areas. Experiment with different attachments throughout your session; the quick-change system lets you escalate sensations without breaking rhythm or leaving the action.

Position yourself and your partner comfortably, then proceed at a pace that feels good for both of you. Entry is easiest with plenty of lube and a relaxed approach. After play, clean the attachments with the included toy cleaner and maintain them with refresh powder. Store in a cool, dry place away from direct sunlight.

Feature breakdown

Who it suits

Couples seeking variety and convenience in strap-on play will love this kit. If you want to experiment with different sizes, escalate sensations mid-session, or try hands-free scenarios, the three-attachment system and Vac-U-Lock technology deliver exactly that. Beginners can start with the slim purple attachment and progress to larger options. Experienced users craving the full 8-inch realistic option get immediate access. Anyone who values both innovation and authentic feel—without sacrificing ease of use—will appreciate the dual-density Ultraskyn material and quick-change design.

Skip this if you prefer a single fixed attachment or if you're not interested in strap-on play. It's also not the right choice if you want a vibrating option or if you're seeking a product for solo penis stimulation rather than partnered penetration.

How it compares

Strap-on kits like this one offer quick-change versatility with multiple attachments in one purchase. E Stim Kits take a completely different approach, using electrical stimulation rather than penetration for sensation. A traditional single strap-on stays fixed once you've chosen your attachment, whereas the Vac-U-Lock system lets you swap sizes without removing the harness. If you want variety and hands-free options built in, this kit excels; if you prefer simplicity and a single, reliable attachment, a standard strap-on may suit you better.

What you can use it with

Pair this kit with Couples Penis Sleeves to add sensation for the penetrating partner during strap-on play. A sleeve worn over the penis during harness use can intensify stimulation for both partners and create a more snug fit inside the receiving partner. This combination works well in swing-based encounters or any position where the harness is secured, allowing you to layer sensations and create new dynamics without switching out your entire setup.

More from Doc Johnson

Doc Johnson specialises in modern attachment systems and lifelike materials across a range of strap-on kits and interchangeable designs. Explore other configurations and styles to find the setup that matches your needs and preferences.

Read more before you buy

For practical tips on strap-on use, positioning, and communication with your partner, Better Than Sex offers a useful guide on the Adultsmart blog.

Why buy the Vac-U-Lock Dual Density Ultraskyn Colors Set by Doc Johnson

Looking for the right fit and the right material? Order the Vac-U-Lock Dual Density Ultraskyn Colors Set from The Cock Ring Store. It's genuine, function-tested, and quality-checked for safety and performance. Cockringshop ships discreetly in plain packaging so your order arrives with your privacy intact. Real fit advice, body-safe materials, and plain-packaged shipping. The Cock Ring Store ships discreetly Australia-wide.