These are the best ever underwear! My husband and teenage son will not wear anything else now. The extra price is worth it. My husband wears these under his Wranglers and under his dress pants. The micro modal material is made from beechwood and is not hot under his jeans in the hot Texas sun on job sites. My husbands prefers the brief cut U5555 while my Varsity football player teenage son wears the trunk style U5554. The whole football team is now wearing these Calvin Klein Micro modals. I have bought a pair of these Calvin Klein Micro modal for every male relative and they have all switched. They are all Texas men and wear wranglers or even dress suites. The only con I can say about these Calvin Klein micro modals is when my husband is offshore fishing and the seas are rough he doesn't wear these Calvin Kleins. He wears his Under Armour briefs. Under Armour briefs are too tight and binding, but they work well when a man needs his underwear to be more binding in rough seas. Otherwise, my husband wears these Calvin Klein Micro modals to the ranch, job sites, and under his Tuxedo. I also like seeing my husband in all the different colors that these come in. It changes things up! No more tighty-whities at all. There are many colors if you just do a search for Calvin Klein micro modals. The company comes out with new colors all the time. My husband wears a 36 inch waist and large fit great. If your waist is 29"-33" buy medium size. If your waist is 34-38 buy a large. I even wear my husband's to bed sometimes. They feel like you are bare. That is how soft they are!