Premium TPE design in Sono No.37 ensures 0.9-inch length and 0.35-inch girth enhancement. This 6-inch stretchy extension fits sizes 3.5 to 7.5 inches for partnered or solo stimulation with secure base strap.
Key Features:
Adds 0.9 inches length and 0.35 inches girth during sex
Phthalate-free TPE material is body-safe and waterproof
Fits penis sizes from 3.5 to 7.5 inches total
Integrated ball strap distributes pressure evenly at base
Available in black, grey, and transparent for discretion
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Sono No.37 Stretchy Thick Penis Extension is a TPE sleeve designed to add length and girth to the penis during partnered or solo play. Measuring 6 inches total with a 0.9-inch length extension and 0.35-inch girth increase, it accommodates sizes from 3.5 to 7.5 inches. The phthalate-free material is waterproof and available in black, grey, and transparent finishes for discreet enhancement.
The Sono No.37 functions by stretching over the penis to create additional length and thickness during intimate contact. The soft TPE material conforms to individual anatomy while maintaining its structural form, allowing the wearer to experience enhanced sensation and visual impact. The integrated ball strap sits securely at the base, distributing pressure evenly without restricting circulation.
Soft TPE construction delivers a body-safe, phthalate-free material that feels natural against skin while remaining durable through repeated use. The non-porous surface supports easy cleaning and maintains its finish across extended use. For those seeking additional enhancement options, Adultsmart's door restraints for BDSM collection offers complementary products for partnered exploration.
| Total Length | 6 inches (152 mm) |
| Sleeve Length | 4.6 inches (117 mm) |
| Sleeve Width | 1.14 inches (21 mm) |
| Ball Strap Width | 0.86 inches (22 mm) |
| Length Extension | 0.9 inches (2.5 cm) |
| Girth Increase | 0.35 inches (1 cm) |
| Compatible Sizes | 3.5 to 7.5 inches |
| Material | Phthalate-free soft TPE |
| Waterproof | Yes |
| Color Options | Black, Grey, Transparent |
Pairing the Sono No.37 with ventilated bondage gags during partnered play can enhance power dynamics while maintaining comfort for both partners. Some users find that combining the extension with extended foreplay allows better accommodation of the additional girth. Communication with partners about sensation and comfort ensures enjoyable shared experiences.
Clean the extension after each use with warm water and mild soap, paying special attention to all seams and the ball strap area. Ensure the material is completely dry before storage to prevent bacterial growth. Store in a cool, dry location away from direct sunlight, which can degrade TPE over time. Keep away from sharp objects that might puncture or tear the material.
Sono No.37 is manufactured from phthalate-free soft TPE, a body-safe elastomer that prioritizes comfort and physiological well-being. The non-porous construction resists bacterial colonization and supports easy hygiene maintenance. TPE's natural elasticity accommodates individual anatomical variation without compromising durability, ensuring reliable performance across extended use and multiple applications.
This extension suits people seeking subtle yet noticeable enhancement without permanent modification or invasive procedures. Those interested in exploring size variation with partners appreciate the reversible nature and discretion of the design. The product appeals to anyone wanting to experience different sensations or visual impact during intimate moments, whether solo or partnered, without commitment to more complex enhancement methods.
For partners who have felt mismatched in size compatibility, finding an enhancement that bridges the gap without discomfort or awkwardness transforms intimate connection. The Sono No.37 addresses this directly through precise dimensional increases that feel natural rather than extreme. What once felt like accepting limitation becomes an opportunity to explore enhanced sensation and renewed confidence. For those uncertain about permanent enhancement, discovering that temporary, reversible options exist removes the pressure of irreversible decisions. The stretchy TPE material adapts to individual anatomy rather than forcing conformity, meaning both partners experience comfort and genuine pleasure rather than accommodation of something poorly fitting. Many find that enhanced girth and length create a psychological shift in confidence that extends beyond the physical experience itself, transforming how they approach intimacy overall.
Our independent testers evaluated the Sono No.37 across fit consistency, material durability, and comfort during extended wear. The extension maintained structural integrity through repeated application and removal cycles, with the TPE material showing no degradation after multiple uses and cleanings. Testers confirmed secure ball strap positioning across the compatible size range without circulation restriction.
Measurable observations showed that the 0.9-inch length extension and 0.35-inch girth increase created noticeable enhancement without appearing extreme or uncomfortable for receiving partners. The transparent option provided the most discreet appearance during use. Individual results may vary based on anatomy, sensitivity, and usage preferences.
| Product | Unique Advantage | Key Difference | Choose This If You Want |
|---|---|---|---|
| Sono No.37 Stretchy Thick Penis Extension | Precise 0.9-inch length + 0.35-inch girth with integrated ball strap | Subtle, proportional enhancement across compatible size range | Discreet, reversible size enhancement with secure fit |
| Hogtie Kits | Dual-purpose restraint system for multiple bondage positions | Focuses on position restriction rather than enhancement | Power exchange dynamics and position control |
| Bustiers | Visual enhancement and body confidence through structured support | Addresses aesthetic presentation rather than functional sizing | Visual appeal and confidence boost during intimate moments |
| Submissive Name Collar | Personalized identity expression through wearable accessory | Psychological and symbolic rather than physical enhancement | Role clarity and power dynamic communication with partners |
Explore our bedroom bondage kits for complementary products that enhance partnered exploration and connection.
Understanding how enhancement affects both partners' experience creates opportunities for better communication and mutual satisfaction. Exploring size preferences and comfort boundaries before introducing new products ensures positive experiences. Our guide to BDSM fundamentals offers approaches for discussing intimate preferences and establishing boundaries that support trust and pleasure in partnered scenarios. An introduction to BDSM communication and consent provides practical frameworks for these conversations.
Ready to explore subtle yet meaningful enhancement, the Sono No.37 is available at Adultsmart. All orders ship discreetly across Australia in unmarked packaging with confidential tracking and secure checkout processing.
Adultsmart.au ships with Australia Post. We ship from Sydney.
All in-stock orders placed before 12pm AEST (Sydney Time) on business days are generally processed on the same day. Packages are usually received 1-6 business days after shipping, but may subject to any postage carrier related delays beyond our control.
Free standard shipping on orders shipped within Australia above $200. For orders below $200 standard shipping within Australia is $12.95 and will be added at checkout.
Orders addressed to P.O box, G.P.O box or Parcel Collect will be handled by Australia Post. Extra time should be allocated for these orders.
Shipping Transit Times (Including Free Shipping)
Shipping time refers to the estimated time that it will take to deliver your order after it’s ready to ship (Please note this does not include time to process your order). Shipping time does not commence after your order is put through but begins the moment your order has been processed and is ready to dispatch via the our freight carrier..
All in stock orders are generally processed on the same day the order was placed on business days for orders received before 12pm. Generally, orders are processed and shipped the same day or next business day.
Orders are typically received 1-6 business days after shipping. For larger packages please allow an extra 1-2 business days for delivery.
If no one is available at your delivery address to accept your order a second delivery may be scheduled or you will be notified that your order can be collected from the nearest depot location.
All orders are generally processed on the same day the order was placed on business days before 12pm.
Generally, orders are processed and shipped the same day or next Business day.
Packages below 2kg are usually received 3-6 business days after shipping. For larger packages please allow an extra 1-2 business days for delivery.
If no one is available at your delivery address to accept your order a second delivery may be scheduled or you will be notified that your order can be collected from the local Australia Post depot.
The price for international shipping is AU$12.95 for orders equal to or below 0.399kg (399grams), and AU$22.95 for orders with a total weight equal to or above 0.4kg (400 grams).
All in-stock orders placed before 12pm AEST (Sydney Time) on business days are generally processed on the same day. Packages are usually received 6-30 business days after shipping.
If no one is available at your delivery address to accept your order a second delivery may be scheduled or you will be notified that your order can be collected from your nearest delivery depot.
Please note in regards to all orders
– These expected delivery dates/times are based on carrier shipping practices, your destination, and the items in your order.
– Expected delivery dates are estimates. Orders can be delayed due to fraud verification or the time of the order being placed. Items that are not regularly stocked cannot be held to the expected delivery dates.
– Orders may be delivered in separate shipments.
– The order cut off times are based on normal Business Hours and exclude weekends and Holidays: Monday – Friday 12 pm
– When your order ships you will receive an email from us with a link to track your order. If you receive your tracking number before 6 pm (AEST) it may not be updated on the Carrier’s website until that evening.
Due to large amounts of online credit card fraud, all orders are subject to approval by our payment verification department. We will notify you by phone or email should your order be delayed.
We have a 14 day return policy, which means you have 14 days after receiving your item to request a refund for any defective products.
Returns and exchanges are only available for faulty items, goods not as described, or in some instances, for incorrect sizing.
Due to health and safety regulations, Adultsmart.com.au cannot resell any returned or exchanged products.
This policy is in place to prioritise your well-being and ensure that you receive the highest standard of hygiene and quality in all products.
To be eligible for a refund, your item must be in the same condition that you received it, unworn or unused, with tags, and in its original packaging.
You’ll also need the receipt or proof of purchase. We do not issue refunds for change of mind or incorrect choice.
Under Australian Consumer Law, we are not obliged to accept returns for “incorrect choice” or “change of mind” so please choose your products carefully.
Any freight and insurance costs to return the item to us are at your expense. This includes the liability for any lost freight – send via registered post.
If your return request is accepted, we will provide you with all instructions on how and where to send your package. Items sent back to us without first requesting a return will not be accepted.
Damages and issues
Please inspect your order upon reception and contact us immediately if the item is defective, damaged or if you receive the wrong item, so that we can evaluate the issue and make it right.
Exceptions / non-returnable items
We do not accept returns for any products that have change of mind, damaged products, or for products that have been used or do not have their original packaging.
Please get in touch if you have questions or concerns about your specific item.
Unfortunately, we cannot accept returns on sale items or gift cards.
Refunds
We will notify you once we’ve received and inspected your return, and let you know if the refund was approved or not. If approved, you’ll be automatically refunded on your original payment method within 7 business days.
Please remember it can take some time for your bank or credit card company to process and post the refund too.