Merino wool is really good at regulating temperature. When it's chilly, wool fibers trap heat in their tiny bends and crimps and this keeps you warm. Then, when you warm up, wool has the ability to transport your heat as vapor. This means it's wicking sweat *before* your skin is actually wet. The wicking during the vapor state leaves you more comfortable at the top of a climb or in the coffee shop. It's also why Polartec created Power Wool which places merino wool specifically at the inside of the fabric instead of a blended thread. So, this is how Merino Wool helps keep you comfortable whether you're on your bike, Ornot