Moisture management clothing for sure. And yes they work. I lump it all into the category of technical wear. It's all I wear all of the time now, warm or cold. I'm a techwear junky
Here are some thoughts:
Wool or synthetic-wool mix is hard to beat: great both as a layer in cold and wick management when hot . . plus it won't smell. Problem: expensive.
Polyester, and/or synthetic blends are a good second place. Much less expensive. The only problem is over time they can start to stink up a bit if you wear them too much.
Depending on your budget, here are recommended brands:
Icebreaker or smartwool for t-shirts and longsleeves men and women. Patagonia has a new marino wool polo and t-shirt. I haven't bought them yet, but on my wish list. Patagonia makes a capalene synthetic as well. It's very nice, but over time it will smell. One third the price of wool though.
Icebreaker, Patagonia, and ExOfficio make awesome technical wear polo shirts as well.
They all make awesome underwear for hot weather too which I highly recommend.
Point6, icebreaker, and wigwam make the best polyester/wool mix socks. Avoid Smartwool. At first they're awesome, but because they're all wool they wear apart rapidly with sometimes less than a month or two lifespan. Synthetic or synthetic wool is much better.
For dressier shirts...Love Patagonia puckerware for button up, polyester mix. Patagonia makes awesome dresses as well for hot weather (according to my wife). You can buy online or if you a Title Nine, they stock Patagonia and a number of other great technical wear brands. Patagonia makes some great longsleeve button ups that are excellent in the summer. I wear them in 90 temps SW Florida in May and June.
Otherwise Mountain Hardware is great too. Ex-officio similar to Patagonia, not as cool looking, but less expensive for sun and wick management button up shirts polyester style. Good fishing shirts as well.
all of the above are favorite brands for various reasons.
I would go with wool if you can handle the price because you can usually rewear it without washing and it's easy to wash in the sink while traveling and it will last longer. I think even though it's sometimes more expensive it comes back to you in terms of longevity and use.
NikWax detergent is your brand for keeping the clothing going for a long time. It's easy to travel with as well.
Finally, If you need or want to watch the dollar don't care about last-year's models, etc, then go to Sierratradingpost.com, sign up for e-letters, and you'll get bombarded with coupons to buy brands like icebreaker, smartwool, mountain hardware, ex-officio and some other great brands. Savings is usually 40% - 75% off new retail. I buy most of my synthetics and wools through Sierra other than Patagonia.
I hope that helps. Happy to answer more specifics both hot and cold weather wear.