I've a mud run/obstacle event this Saturday, and it looks like it is going to probably be close to 40 degrees That isn't going to stop me however, and am rethinking what I am going to wear. For bottoms I will just stick with my dri-fit running/exercise capris that I was going to wear. I figure once I get into the mud and water it won't much matter what is on my lower half and I don't want to wear something that will be dragged down by water and mud. I will wear wool socks.

I've never purchased a compression fitness top - and I don't have much of a budget nor much time in which to find one. What is the best kind of store to find this sort of thing without paying a fortune? I am sure my LRS would have something, but at a higher cost than I can swing. Unsure what a compression top even looks like in person so I wouldn't know it if it bit me at a second hand store.

Any thoughts? Would it make more sense to wear a LS wool base layer beneath a t-shirt?