As a long-time buyer of underwear from a certain well-known high street retail chain, I have been amazed by how good these Amazon brand briefs are. Quite simply, these are the best 'Y-front' style briefs I have bought for some considerable time.
The cotton fabric is very soft (with a slight silky kind of texture), and lightweight but I find them very 'supportive'. The waistband, while stretchy does not cut into one's midriff the way some other brands can do, and perhaps most importantly, they have not shrunk in the wash (done at low temperatures of 0 and 30 degrees)!
However, I have noticed one thing which I think may be worth mentioning. Being an optimistic chap with an aspiring 37" waist, I decided to buy the 36" waist size (the 'large' size) thinking that as they are 'stretch' briefs, they would stretch sufficiently to fit my waist, which they did. But I had not considered the size of the leg openings. Now I do not have particularly muscular (read 'bulky') thighs but I did find the 'large' size briefs were a little snug (read close fitting) around the top of the legs and became a little uncomfortable to wear as the day progressed. So I decided to stop being optimistic about my size and buy the next size up (XL or 'extra large'!) and I have to say they are a terrific fit, with no discomfort in the 'leg-meets-trunk' area, and no sagging at the waist (even though they are supposedly slightly larger than my actual waist size).
So, overall, I think these briefs are terrific value for money and provided Amazon does not tinker with the quality or specifications of these briefs, I will definitely buy them again in the future.