Purchased upon reading that a glove liner would make gloves warmer. Previously I had been wearing a glove designed for cold weather, but it was bulky and limited the feel of the controls.
Upon buying these, I discovered I could wear my typical sport gloves with the thinner palms, and still maintain the same level of warmth. This was effective for a 90 minute ride at 22 degrees-F last week.
Helps to buy a size smaller than you typically buy in gloves. Very slick and don't stick to the insides of the gloves. Fit like compression clothing.