Romwrote a review of Castelli Nanoflex Bib Shorts on January 4, 2016
Familiarity: I've put it through the wringer
Other reviews have covered these shorts exhaustively. I've purchased four over the past 2 years and have these comments:
1. I'm 5'4" and weigh 127 lbs. Live in Seattle and commute every day, rain and/or shine and these shorts endure wear during wet/cold days here. The shorts have held up very well except for the iron-on logos. Believe it or not, I've taken to gluing the "undone" corners of the lettering with fabric/vinyl cement (I must have some serious OCD or past life regression issues. Probably both).
2. Castelli's "Care" info on their website says that the DWR and Nanoflex treatment will hold up for "40 - 50 washings". I haven't washed them as many times but repellency seemed quite a bit less after 5 or so washings. Castelli recommends washing (machine or hand), then tumble dry under low heat for 20 minutes or pressing with a warm iron. I've tried both and the results are OK. What works best for me is to wash with NikWax Tech Wash followed (while wet) with NikWax TXDirect, then tumble dry for 20 minutes. Afterwards, repellency was like-new and haven't had to be re-treated so far this winter.
3. Fit: When new, the shorts were very, very tight. Over time, they've loosened up a little bit. I'm glad I had stuck with size small as opposed to sizing up.
4. Call of Nature: it would be helpful if if the bib fronts were cut a little lower to facilitate irrigation.
5. Other: The leg grippers do a great job with knee or leg warmers (especially the Nanoflex warmers and their silicone grippers). The hems of the shorts don't ride up over the warmers wet or dry. I've used them without the warmers and the grippers didn't irritate me (full disclosure: I shave). Inseam length: these are cut longer than my Pearl Izumi PRO shorts. However, the longer length is a nice interface with the Nanoflex warmers. Again, the grippers stay put and the warmers don't sag.
6. Pad: three of my shorts purchased last year have the same pad (Kiss3). The 4th pair, purchased in November this year, has a different pad labeled Air which. may be the Kiss Air spec'd for the current Nanoflex 2 shorts. In any event, these Kiss pads hold up well in cold/wet conditions.
Overall: So far, the Nanoflex bib shorts have been a great value. If you had the fortune of purchasing these during the recent 50% Off Sale, they're unbeatable. I've several thermal shorts from other companies that haven't seen use in wet or transitional conditions last winter or this winter because the Nanoflex shorts have the range the others don't possess.