Jack Adams™ underwear and shorts/pants sizing is measured at the waist. To find your correct waist size, measure your torso about one inch below the belly button. To find your size in all of our tops and hoodies, measure your chest around, at approximately one inch below your arm pit.
Size Chart - INCHES
| SIZES (inches) | S | M | L | XL | XXL |
| CHEST | 35-37 | 38-40 | 41-43 | 44-47 | N/A |
| NECK | 14-14.5 | 15-15.5 | 16-16.5 | 17-17.5 | N/A |
| WAIST | 27-29 | 30-32 | 33-35 | 36-38 | 38-43 |
Size Chart - METRIC
| SIZES (cm) | S | M | L | XL | XXL |
| CHEST | 89-94 | 97-101 | 104-109 | 112-118 | N/A |
| NECK | 36-37 | 38-39 | 41-42 | 43-44 | N/A |
| WAIST | 69-73 | 76-81 | 84-89 | 91-97 | 97-109 |
- 5 stars: 50 (96%)
- 4 stars: 1 (2%)
- 3 stars: 1 (2%)
- 2 stars: 0 (0%)
- 1 star: 0 (0%)
Very comfortable. The front pouch is supportive without being constricting and the back is thin enough it is not even noticeable.
super comfy g-string. I own 2 colours now but it will be more in future as it feels great on the skin and fits perfect.
Thank you for your wonderful review! We're delighted to hear that you find the Modal String Thong so comfortable and perfect fit. We look forward to serving you more in the future.
Most comfortable brand I own, and I have many different brands
Thank you, Richard! We're delighted to hear the Modal String Thong is your most comfortable choice. We appreciate your support and look forward to serving you again.
Simply the best thong out there wear all the time like wearing nothing great feel on the boys
Thank you for your fantastic review! We're delighted to hear you love the Modal String Thong and enjoy wearing it so comfortably. We appreciate your support!
The fabric is light and soft. Feels great on the skin. The waistband is my favorite. Very comfortable. The waist was big on me. I wear an XL in all other Jack Adams clothing, except these. I would definitely recommend these if you get the sizing right.
Hi Tim, thanks for the detailed feedback! We're glad you love the fabric and waistband. We'll take your sizing note into account. Thanks for recommending us!
Been searching lately for some Thong underwear and stumbled across Jack Adam's thongs! Let me tell you these things are more comfortable than I could have ever imagined. Truly the most comfortable underwear I have ever wore!! Bought a pair to try and now have 5 pairs! Will forsure be a returning customer.
Thank you for your wonderful review! We're delighted to hear you're enjoying the Modal String Thongs and appreciate your continued support. Looking forward to serving you again!
Recently been switching from boxer briefs to thongs. Like others, I’ve tried the usual suspects, but haven’t found ‘the one’ until now. The waistband is the perfect size and the overall fit is excellent. This thong gives great support without the bulk. Can we talk about shipping? My order was a great experience from start to finish. Great customer service and quick delivery! I’m a huge fan!
Never thought I would be reviewing something like this but they are so comfortable and we'll fit you hardly know you have them on. I wish I had purchased them in large instead of XL as im right at the cross over line. Did get one in large and can't say enough so well fit keeps them free yet contained. Highly recommend.
Sleek and light but also absorbent. Looks great!
Love these simply the best soft
I Have wore many thongs these are the best of the best try them you will love them like wearing nothing
Best string thong on the market, feels like nothing is there.
Once you try you will be hooked I’m 68 yrs old didn’t think I would wear a thong bought it mainly to sleep in now wear all the time I work outside a lot they are cool and like wearing nothing best ever
Best thong I have ever wore hands down
Best Thong out there like wearing nothing after you try you will be hooked
The Modal String Thong is the best choice for that I’m wearing nothing all feeling but with great support where you need it.
An awesome thong, great fabric with a good feel!
These thongs have great fabric, are very comfortable and look attractive!
Bought these as a gift. They’re sexy on and very comfortable from what I’ve been told. The colors are great too, not your typical colors, richer/deeper shades. Bought him 3-4 pair, very happy!
I followed other reviewers suggestions and sized down to a small. I’m 5’10”, 170lbs, 32” waist. It fits perfectly and often I can’t remember I’m wearing it.
Can’t even feel it’s there yet it is very supportive for the boys.
This thong is so comfortable. I could easily wear everyday. However, like at least one other reviewer I find the thong in the back a bit long, I would like a shorter "string" for the waist band to sit a little lower on my back to be a little more discreet. I would also prefer a little more frontal coverage like the Jack Adams Bikini thong, but this is more comfortable overall. I am 5'10, 160lbs, normally wear a size 31-32 pants and purchased a size medium in Oct-2023, but I think if I ordered again I would try a size small.
Most comfortable men’s underwear I’ve ever worn.
One of the most comfortable thongs I’ve worn!
I have changed all my underwear to thongs, love the comfort they provide, The Jack Adams string thong and the bikini thong are my favorite ones. They look great, the material is so soft and they are very comfortable. Would highly recommend them
I absolutely love these and best part is that you can’t even feel them.
Feels great and very comfortable. Absolutely love these and can’t even feel them.
I was not sure about these at first due to their minimal nature. I decided to give them a try and was very surprised at the comfort especially in the hot weather. I normally wear an XL in other JA products but went a size down to a large in these and they are a perfect fit. Give them a try. You’ll be surprised and happy you did.
Great string thong. Straight guy who’s been wearing g strings and thongs for many years and these are some of the best. Material gives and holds your junk nicely. Balls don’t spill out of the sides of the pouch. Can’t even feel the string up your butt. Very comfortable. Will buy more.
I own countless thongs and wear thongs daily. It is really hard to find a real true string thong but here it is! This is the first true g-string thong I own and it is absolutely amazing! The pouch is perfect and the string is so thin you literally feel like you aren’t wearing anything! Great under scrubs for work! Super soft, comfortable amazing colors! I ended up buying a total of 10 I like them so much!
The best, extremely comfortable….have ordered many!
I could barely tell these were on! The stigma around thong underwear is there's a string up your butt; these lifted that for me and are now my 'go to' under tight pants. They are comfortable and keep everything together up front.