Bought these after much deliberation and I’m very happy with them. The leggings are heavy enough I can wear them in their own, but I’ve also layered them under dresses and hiking pants. The medium is true to size; I have wide hips and a smaller waist and they don’t slide down, and the M is close fitting but not skintight. Won’t function as a compression layer if that’s what you’re looking for.
This is a good weight—too cold for windy city walking without a coat at 30ish degrees Fahrenheit, but perfect under light hiking pants for sunny day hiking at 35F. If I were running I’d probably be ok at lower temperatures.
Added plus: can wear multiple times without bagging at the seat and the knees. Fabric is pretty soft; if you have really dry skin I’d moisturize before wearing to prevent static.