I generally have boxer briefs, and have tried various brands and fabrics. I have a few pairs of Merino from Icebreaker, SmartWool and exOfficio. I like the Icebreaker one (a relay boxer brief with fly) but I am not sure its worth the price. The Smartwool one I have is over 12" long, and I find it a bit too long. Too long boxer briefs for me means the legs ride up especially when going uphill and has more chance of chafing or you have to keep reaching in and pulling the legs down. I'm not sold on Merino jocks for value for money, but the merino leggings are awesome. I have an Icebreaker lightweight 150g one, and a mid weight 260g one and took those with me.
The other jocks I took for my month in Nepal were cotton or poly-cotton boxer briefs like the Bonds guy front trunks. I didn't have chafing issues with them.
I have just recently discovered these Uniqlo Airism boxer briefs.
http://www.uniqlo.com/us/product/men-ai ... r-briefs/~ I can't find them on the Australian Uniqlo site, and bought them last month in Singapore. But I tested them out on some humid walks in Asia, and have used them under merino thermals here, and they are so nice and comfy. I don't know what the Airism material is but it's silky feeling, and drys quickly - and they say it has odor control. They were about $15/pair. I'll have to ask Uniqlo aus if they will bring them out after the winter range.
You can see more of the Airism range on the Uniqlo's US site:
http://www.uniqlo.com/us/men/innerwear- ... rwear.htmlI walked the EBC trek in October 2013, and it was freakishly cold. There was a typhoon in the bay of Bengal that dumped the cold weather and snow when we were there so I was glad to have my merino undies and leggings. On the way from Phakding to Namche it rained for half the day, and I hadn't bothered with rain pants, so walked with a wet bottom half. That's when I found out the longer boxers weren't so nice as they tended to bunch up with the inclines. The other boxers that were around 6-8" or so were better. But having the Merino thermals was great, as they still kept my legs warm even though they were damp.
I walked the Annapurna side in November, and found that it was significantly warmer and more humid than walking in Sagarmatha National Park (around between 25-30 degrees), even for the areas between 1500-3000m like the walk between tikhedhunga and Ghorepani. Those 3500 stone steps really pushed the undies up, so I wore a mid thigh compression undies over my jocks.