I hike and camp a lot in the middle of the hottest days of the year and there are a lot of times that it is for long periods of time with no access to showers. I was wondering what you have heard about Icebreaker underwear and how well they are about odor. – Katherine, Greenville, S.C.

Well, that’s a tough one: It’s true that some of today’s clothing items are more smell-resistant than they used to be, but there are limits. Most of you remember that dark blue long underwear that was so prevalent in the 1980s. With that stuff, bad smells would chemically bind to it like hydrogen to oxygen molecules. Whew. Nasty.

Icebreaker advantages: I’ve never done an extended stink-proof test on my Icebreaker stuff. Over the course of a few days it always seems fine. And is billed as naturally odor-resistant. It doesn’t have an anti-microbial finish, but the merino wool isn’t prone to absorbing odors. That’s due to several factors. For one, wool’s ability to absorb moisture keeps the skin drier, so microbes there don’t find as much moisture in which to grow. Its texture and subatomic charge is different from synthetics, so it doesn’t tend to attract odor-producing bacteria. And it’s able to “hold” bad smalls and release them in the wash, rather than releasing them all the time.

Icebreaker’s lightest piece is the Bodyfit 150 Atlas tank ($40), a sleek, sleeveless piece that would work well in hot weather.

Other choices: Some fabrics also employ add-on odor-defeaters. Patagonia, for instance, uses a process it calls “Gladiodor,” in which natural amino acids added to the fabric coating basically eat bad smells. You’ll find it in the Capilene 1 Crew ($36). Some of Marmot’s base layers, which use natural cocona fiber, also are billed as naturally odor-fighting (Lightweight LS Crew – $38).

Nothing is perfect: In time you will smell. Take two base layers if you can, and keep one as dry as possible while exchanging the daily. And wash things out in water when you can. In time, you will embrace the naturalness of it all.

To ask a question of the Gear Guy, you can find Douglas Gantenbein at www.outsidemag.com.