Does anyone know if the Under Armour brand clothing is very effective for keeping you cool under leathers (the hot weather stuff). And will the cool weather stuff keep you warm if that's all you have under your leathers in the winter? If Under Armour is not a good choice, does anyone have other suggestions? I'd like to be able to extend my riding season further into winter, but don't like the bulkiness added by insulating layers, and I thought the hot weather stuff might help keep me cooler during those hot humid summer days in the mountains with full gear on. Comments or suggestions would be appreciated. Thanks.