Size:
4
Shipping Estimate
USA
- USA
- CAN
- USA
- CAN
Ships within 48 hours · Estimated delivery Jul 7 - Jul 12
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For Your Every Summer RSVP, with Code: SUMMER15
Description
dress shirt button extender Black Metal Collar Extenders (6 Pack) – Johnson & SmithYOUR BREATHING ROOM BACK: Opt for premium comfort and expand your dress shirt collars by neck size to make them more comfortable to wear and save money from replacing too tight neck shirts. TOP QUALITY + FREE EXTENDER: Johnson & Smith collar extenders make your durable buddy for lifelong use. Made from environmentally friendly, super durable zinc alloy. CONVENIENTLY DISCREET: Just 10mm (3 8) in diameter, those neck extenders are your secret ally for
- YOUR BREATHING ROOM BACK: Opt for premium comfort and expand your dress shirt collars by ½ neck size to make them more comfortable to wear and save money from replacing too tight neck shirts.
- TOP QUALITY + FREE EXTENDER: Johnson & Smith collar extenders make your durable buddy for lifelong use. Made from environmentally friendly, super-durable zinc alloy.
- CONVENIENTLY DISCREET: Just 10mm (3/8”) in diameter, those neck extenders are your secret ally for peerless comfort and a unique sense of freedom in use!
- EASY TO USE: Attached in less than 5 seconds. No sewing is required to attach our metal shirt collar extenders to your shirt! Simply loop one around your shirt button or daisy chain a pair of them together for even more space.
- BETTER THAN MONEY-BACK GUARANTEE: At Johnson & Smith we take pride in the quality and craftsmanship of our products and we back these extenders with a lifetime warranty. Better yet, you don’t even have to return the products if you’re not absolutely thrilled with them.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.7 ★★★★★
Based on 206 reviews
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Product Reviews
★★★★★ 5
Solid Product, lots of it too
Ive had the insane rattling from my subwoofer and the highway drone from my aftermarket exhaust, and this 80mil sound deadening mat was the exact fix I needed. The 36 sqft kit (which comes as 33 pieces) was plenty to fully cover my trunk, rear deck, and floorboards. Since it's a butyl-based material, there’s no awful asphalt smell, and it adhered incredibly well with just a simple roller.
The difference is honestly night and day. My bass hits so much tighter and cleaner now without the whole back end vibrating like a tin can. Even better, the cabin is significantly quieter at high speeds; that aggressive exhaust drone is finally muffled to a deep, tolerable purr. If you want an affordable way to upgrade your audio quality and actually hear your music on long drives, I highly recommend this! It took some weekend elbow grease, but the payoff is incredible.
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Reviewed in the United States on March 24, 2026
★★★★★ 5
Would recommend
Size: 10 sqft
I used this sound deadening material in my car during an audio and interior upgrade, and the difference was noticeable immediately. Road noise, vibrations, and rattling were reduced a lot, especially on the doors and floor panels. The car feels much quieter and more solid while driving now.
The material was easy to cut and apply, and the adhesive stuck very well without peeling up. It has a quality feel to it and conforms nicely around curves and tight areas. I also noticed my speakers sound cleaner and have better bass response after installing it.
For the price, this sound deadening material is a great value and definitely worth it if you want a quieter ride and better overall sound quality in your vehicle.
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Reviewed in the United States on June 6, 2026
★★★★★ 5
Worth it!
Size: 50 sqft
I was worried it wouldn't work as well since it's 50 mil and I thought I got the wrong thing. Nope! Works great. Did all four doors on my 93 civic and I have enough for the floor I think. Solid price. Noise reduced by about 5 decibels hive difference. Very sticky and easy to apply I'm so happy I was able to cover most all of my car. If I need more, definitely buying this since I got so much extra and I thought I would.
PS: that five decibel thing is only with the four doors. My firewall is next and then my floor, but it's such a huge difference
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Reviewed in the United States on April 2, 2026
★★★★★ 5
Quiet your vehicle noises
Size: 50 sqft
Put this in our high roof van and couldn’t believe how much quieter it was at once. Really cut down on the vibration noise Nice and easy to install just peel n stick. Was also easy to cut with scissors for smaller areas. Seemed to be really nice quality. Didn’t notice any odor.
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Reviewed in the United States on June 9, 2026
★★★★★ 5
Sound deadening the Hot Rod
Size: 20 sqft, Size: 20 sqft
Works well, good value for the money.
It’s very sticky and conforms to what you are applying it to. One 20 sq ft box did approximately the passenger side
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Reviewed in the United States on April 3, 2026
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