Merino wool is a fantastic material - it does not itch most people, even those who cannot tolerate regular wool, it also keeps you warm even when damp, and naturally resists odors. The Hanworth is a good choice for cool weather and as liner gloves for heavier gloves or mittens. As a bonus, the tips of both thumbs and index fingers have touch-screen compatible material. This is a one size for all adult's model - it fits most adults thanks to its stretchy material. *Note!* Just to be clear: this product is not waterproof, even though SealSkinz is best known for its waterproof accessories.