Wool. we wear it winter and Summer. For our bike touring we have found it is the only fabric that resists all bacteria so even if it’s not washed it never gets stinky and it’s cool or warm by turns and you never get chilled if it gets wet. No other material works as well. Silk is awful it’s not warm and it’s freezing if it gets wet. All the man made fabrics develop an odor that renders them unwearable if you sweat i them . You can buy Merino underwear so you are “ good to go” from the skin out for all four seasons. Wishing you many comfy hours on the trails. c ( Trailrunner here.... phone wont let me change name)

Some favorite items:

Jockey for Her underwear, seamfree: Jockey seam free

I also have some SPF protective clothing I got from REI that’s dry-wicking.

Wow wool, I would never have thought of that. I live on the east coast and it is really hot and humid in the summer. I have already been uncomfortable and it has been a cool spring. I wear a lot of cashmere in the cooler months, but rarely any other kind of wool, I find it itchy. I'll look for a super light weight wool t-shirt and give it a try.

The east coast variant of wool is linen. No way I could wear wool except in the winter, super hot and muggy here.

I do like performance fabrics but not clingy ones, for warm weather.

I wear the nylon-y looking t-shirts that are always sold in the athletic areas of stores. I've bought multiple brands and even the ones I haven't paid much for are great. I always buy t-shirts at least a size bigger than most people do, and maybe that helps in this case, I'm not sure. But even in the Texas heat, I'm comfortable wearing these all year round on my 3-4 mile daily walk.

Merino wool is a naturally wicking fabric, and doesn't get stinky like synthetic tech fabrics. It comes in very lightweight jersey that feels like t-shirt material, and isn't itchy. It is however expensive. I have some merino underwear that I bought at a factory outlet for about $20 a pair.

I am a merino wool convert and I live in the south. Uniqlo has some really inexpensive stuff I bought for a trip to Ireland (both athletic wear, crew sweaters and underwear) in addition to the better brands like Smartwool. I figure I don’t feel bad about tossing them if they don’t perform. So far I like them as well as the more expensive brands.

I still have a lot of Athleta t-shirts and tanks I wear though that I really like, and many have sun protection. They last forever and I find a lot on their sale page. Ditto the REI wear, but I am not as crazy about theirs, something about the feel.

Try Ibex Wool as well. I like their athletic apparel. Nothing itchy or uncomfortable in their range of goods.

Duluth Trading Armachillo , this is what I wear when we go backpacking, and if you want hot climb a mountain with a 50 lb pack. We havent done a big hike in a few years, but are this year and I am in training now, the sweat pours off of me.

https://www.duluthtrading.com/womens-armachillo-cooling-hi-cut-underwear-33759.html?dwvar_33759_color=BCF&cgid=womens-underwear-undies&ev3=#start=6&cgid=womens-underwear-undies

RE: the Duluth product

Would people really pay $13+ more to get a particular color? Of underwear? I’m tempted to try them but I’d better act fast to get a cheaper color.

For underwear, I really like merino wool for hiking. I've used and liked Smartwool but I know Icebreaker is fantastic quality and I keep meaning to order some and give them a try.

I have Ibex underwear that I bought in 2016 and it still looks new. I also have Smartwool and Icebreaker. I bought a lot of wool Terramar tshirts from Sierra Trading post . I have some that are 20 years old and still look new . As others have said they are fine in summer and there is no itching. Good Luck , c

These are theIcebreaker underwear that I have. I've had them several years, and wear them weekly, and they still look great. Costco usually has Seg'ments brand long sleeve merino T-shirts in the fall for around $20. I actually buy merino wool fabric from New Zealand, and make my own clothes from it.

Thank you everyone. Since I am not able to shop in person I will wait on the wool as it is quite pricy and I really need to touch and feel it as my skin is very sensitive. I am going to try and find some inexpensive performance t-shirts on line. I have some bamboo and rayon panties that are better than cotton, but I think there is something better out there. Odor is not my problem, but I hate feeling wet and sticky.