good beanie and yes LTW stands for lightweight
This is a very nice beanie. It is thin and fits snugly just like you could imagine from the picture. It's warm but obviously not as warm as a heavy fleece beanie. (previously my favorite beanie was Mountain Hardwear Micro dome, also an awesome beanie.) It fits perfect under a helmet and has a very low profile when worn alone. I have a shaved head and the Rho doesn't itch. I drive a jeep with the top off from early spring to late fall and this is going to be perfect for those cool windy drives in the early morning and late night. The only reason it's not getting a 5 is because it is a little pricey but that comes with the Arc'teryx name doesn't it? Otherwise it is a very good piece of gear. Yes it's lightweight just like advertised and just like I wanted.