never dude! use icebreaker, this brand comes from New Zeland, is the shit in layer really, they are a bit expensive but theres always web pages like backcountry .com with them on sale, and look for its tecnology and read it, its like a natural termostat, you ll be warm if you need it and youll be cool if its hot, if u suet, it will dry in less than 5 minutes and u can wear it for a month and it wont smell cause is made off a special merino and is not synthetic.
a have like 2 long sleeves and like 5 short sleeves and they are great for trips to cause u dont need to wash them so much, it might sound weird but ull know it when u use them.
heres the page www.icebreaker.com
oh and for the second layer anything thats made of Polartec is the best thing, the warmest thing ever to.
sory is my spelling is not to good, english is not my first language.