Vac-U-Lock Ultraskyn Strap On Harness Set by Doc Johnson

Vac-U-Lock Ultraskyn Strap On Harness Set by Doc Johnson is a complete strap-on system featuring three interchangeable dual-density realistic dildos and an adjustable harness. The quick-change Vac-U-Lock mechanism lets you swap attachments mid-session without removing the harness, while the phthalate-free ULTRASKYN material softens and responds to body heat for authentic sensation.

What it is

Vac-U-Lock Ultraskyn Strap On Harness Set by Doc Johnson is an American-made strap-on system built around a quick-change attachment mechanism that lets you interchange three realistic dildos without stopping or refitting the harness. Each attachment is sculpted from dual-density ULTRASKYN—a body-safe, phthalate-free material with a soft outer layer that warms to your skin and a firm core that provides substantial fullness. The Supreme Harness adjusts across a wide range of sizes and includes three O-ring sizes, making it compatible with all three attachments and with realistic dildos from the wider Doc Johnson range.

What sets this kit apart is the adaptability without compromise. You are not choosing between realism and variety—you get both. The harness is well-engineered for comfort during extended wear, and the inclusion of maintenance products (toy cleaner, lube, and refresh powders) means the attachments will perform consistently over years of use.

The features that matter

• Dual-density material: Soft outer layer and firm core create realistic texture and response to body heat during penetrative play.
• Three interchangeable attachments: Switch between 8-inch realistic, 7-inch full-size, and 7-inch slim without removing the harness.
• Vac-U-Lock quick-change system: Snap-fit design holds attachments securely and releases instantly, keeping momentum during sessions.
• Adjustable Supreme Harness: Fits waist sizes up to 69 inches with secure pad and plug system for any body type.
• Complete maintenance kit: Includes toy cleaner, water-based lube, and refresh powders to maintain material quality and hygiene.

Full specifications

• Material: Dual density ULTRASKYN (phthalate-free, talc-free, non-porous)
• Attachment dimensions: 8-inch realistic dong, 7-inch full-size cock, 7-inch slim cock (insertable lengths vary slightly)
• Colour: Vanilla (warm neutral tone)
• Harness adjustment: Up to 69 inches waist circumference with three O-ring sizes (small, medium, large)
• Closure: Adjustable velcro and secure plug-and-pad system
• Box contents: Supreme Harness, three ULTRASKYN attachments, water-based lubricant, toy cleaner, two refresh powders, instruction guide

How to use a realistic dildo step by step

Begin by selecting which attachment suits your mood and body that session—start with the 7-inch slim if this is your first time using a strap-on, or the full-size if you have prior experience. Snap the chosen attachment into the Vac-U-Lock base by pressing firmly until it clicks and locks in place. Step into the harness, fasten the velcro straps snugly around your waist, and adjust the O-ring size if needed so the attachment sits at a comfortable angle. Apply water-based lubricant generously to both the attachment and your partner's body. The realistic masturbators in our collection use the same body-safe lubrication principles, so apply in the same way.

During penetration, start slowly and communicate constantly—let your partner guide the pace and depth. The dual-density material will soften slightly as it warms, offering a more lifelike sensation as the session continues. If you wish to change attachments mid-session, simply press the release button on the Vac-U-Lock base, remove the current attachment, and snap in a new one. After use, remove the harness, detach all attachments, and clean with toy cleaner and warm water. Allow everything to dry completely before storing.

Should you choose this one?

Care and storage

Clean all three attachments and the harness interior after every session using the included toy cleaner and warm water. Rinse thoroughly, then air-dry completely on a clean cloth or towel before storing—moisture trapped in seams can promote bacterial growth. Once fully dry, dust lightly with the included refresh powder to maintain the material's soft feel and prevent tackiness. Store the complete set in a cool, dry place away from direct sunlight and heat sources. The ULTRASKYN material can degrade if exposed to extreme temperatures or stored in airtight containers while damp.

Want to know more?

Strap-on harness systems have evolved significantly over the past decade, with quick-change mechanisms and realistic materials now standard in quality kits. Understanding the difference between dual-density and single-layer materials, and how harness adjustment affects comfort and control, helps you make the most of your system. Read more in our guide: Why Everyone Should Own A Realistic Dildo.

What to expect

The dual-density material feels noticeably more lifelike than single-layer silicone—the soft outer layer warms quickly to body temperature, while the firm core maintains structure and provides substantial sensation. First-time users often underestimate how much the harness fit affects comfort; take time to adjust the velcro and O-ring sizes so the attachment sits naturally without shifting during use.

The Vac-U-Lock mechanism is reliable and intuitive, though the attachment should be pressed firmly until you hear or feel it click. People commonly snap attachments too gently on first attempts and then worry they are not secure—firm pressure is the correct technique. The quick-change system genuinely works mid-session without fuss once you understand the release button placement.

Cleaning is straightforward with the included toy cleaner, but allow proper drying time—the dual-density material has small crevices where moisture can linger. Users who rush drying or store attachments damp report odour or surface breakdown; full air-drying prevents this entirely. The refresh powder maintains material suppleness if used regularly; skipping it is fine, but the powder extends the lifespan noticeably.

The 8-inch realistic attachment suits experienced users, while the 7-inch slim is better for beginners or those preferring a smaller sensation. The harness is comfortable for sessions lasting an hour or more, though some users prefer removing it between penetration for a break. This kit holds up well with consistent maintenance and typically outlasts cheaper non-quick-change systems by years.

How it compares

Why it earns its place

Check out Vac-U-Lock Ultraskyn Strap On Harness Set by Doc Johnson if you want a complete, well-made strap-on system that delivers realism without compromise. The three interchangeable dual-density attachments, quick-change mechanism, and Supreme Harness create a kit that handles multiple preferences and body types—rare in a single purchase. Order it from Malechastity.com.au with discreet Australia-wide delivery and start exploring with confidence backed by Doc Johnson's established reputation for durable, body-safe design. Plain Packaging, Total Privacy, Every Order.