Reddit mentions of Calvin Klein Men's Body Modal Trunks, Black, Medium

Calvin Klein Men's Micro Modal Trunk
http://www.amazon.com/gp/product/B000FEC8WY/ref=oh_details_o08_s01_i00?ie=UTF8&psc=1

• These are inexpensive, pack of 3, if you zoom in you can see the seams are out of the way. They're fairly soft. However, they don't keep you quite as "dry/cool" due to being 50% cotton, and they lose their shape/elasticity slightly over time.
  
  
• This is 92% polyester 8% spandex, it holds it shape perfectly and will be very cool/dry. However, it does have a middle-seam, but personally I don't find it uncomfortable. That might vary person-to-person. Slightly more expensive, only 1-pair.
  
  
• This is 91% polyamide/nylon, 9% spandex. It will keep you dry/cool, but unlike the 92% polyester above, it will feel much softer than any other blend. Holds its shape perfectly. These types cost more because they feel softer and they look sexier. The nylon/spandex types are more skin-tighter. But if that sort of stuff doesn't matter to you then don't bother I guess.
  
  
• This is much like the above, modal/lycra is nylon/spandex. The one pair that I have doesn't hold its shape quite so much but it's a looser fit. It feels extremely soft, but there is a seam. Causes no problems for me, though. But I don't like the waistband logo, so I do in fact prefer the above, because you can cut off the Jockey tag and there's no logo anymore.
  
  I'd start by solving your seam-chafing problem and go from there. It's hard to say for other underwear because most trunks/boxer briefs do in fact have the mid-seam, but the difference is that they do a much better job of supporting your junk and keeping it in place, so less movement= less chafe. And regardless of seams or not, they will probably feel more comfortable so long as you pick good stuff.
  
  Obviously you could spend more time shopping about, but those I personally own and like. But no two dicks are the same. Everyone should be picky about their underwear. But, I'd go with #1 since you're used to boxer shorts.

Man here, but I want to chime in and say that while expensive, these are the most fantastically comfortable underwear my junk has ever had the pleasure of hanging out in. They also look awesome, and my girlfriend loves them.

Read some amazon reviews and decided to splurge a bit an buy these: http://www.amazon.com/gp/product/B000FEC8WY/ref=oh_details_o00_s00_i00?ie=UTF8&psc=1

Here's hoping that they're worth the money, but not so much so that I frown on my current 3/$10 set-up.

A week has gone by (almost) and per this thread I bought both:

Ex Officio Give and Go

calvin kline micro trunk

Ex Officio is awesome. I like the overall feel and how it wears.
The Calvin klines are okay, a little too short on my rugby thighs so they ride up. I do like their Cock Pouch though, real comfy.

personally I like calvin klein boxer briefs. But if you're on a budget just get hanes. Also be mindful of the length. If you wear fitted pants the boxer briefs with roll up. That was the problem with boxers for me, all the bunched up fabric whenever i pulled my pants up.

I like this one

https://www.amazon.com/Calvin-Klein-Micro-Modal-Medium/dp/B000FEC8WY/ref=sr_1_4?s=apparel&ie=UTF8&qid=1466006817&sr=1-4&nodeID=1040658&keywords=calvin+klein+underwear