I have three different tights: Shebeest Windpro, Sugoi Subzero and Sugoi Helix. Despite being the thinnest and cheapest of the lot, the Helix are my favorite, no matter the temperature. Above 40, I wear shorts under them. Below, I wear knickers. I've gotten either too cold (the Windpros) or chafed (the Subzero's have a seam in the crotch that bothers me) with the others.