They have X-Static and Under Armour,,I'm sure there are more brands.
I'm looking for a base layer that will keep me cool in the heat and warm in the cold.
Could someone please recommend s base layer that they like?Thanks

Try base slayer climaflex available at Cabelas, a little pricey but they should work. I use X-scent or the Medalist underwear and when it gets cooler I adjust by putting a poly- fleece underwear over the base layer. The base layer will wick moisture to the fleece layer and keep it away from your skin.
My warm weather set up is X-scent then scent loc liner suit and de-scented predator camo with a de-scent spray along with all equipment being sprayed.
Cold weather set up is X-scent or Medalist base, Cabela's expedition weight long johns and insulated scent loc suit along with a de-scent spray for all external equipment, gloves, boots and hat.