As you might imagine, the Mountain Hardwear Mens Heavy Weight Wool Stretch Glove is a stretchy glove which is made using heavy weight wool!
That rather over-simplifies a very well thought out glove though, a glove which combines the best attributes of natural and synthetic fibres. As well as insulating wool, polyester is used for its moisture movement properties, as well as nylon for durability and elastane for a snug, stretchy fit. This produces a tough glove which fits close and moves with your hand, and keeps you warm when it's wet and cold. Flatlock seams add more comfort to the mix, but even that's not the whole story: welded palm and finger patches add wear resistance and enhance grip.
Snug fitting means efficient warmth, but it also means that as well as a glove in its own right, it can be worn as a liner under a bigger glove or mitt in more inhospitable conditions.
So yes, it's a Mens Heavy Weight Wool Stretch Glove...but there's rather more to it than that.