I use this tight over my bike shorts. Advertised as a cold weather tight with insulation, I found this to be untrue, and best use in 45 degree weather. No insulating properties with this tight.
I use these for cooler weather riding, they're not insulated or lined so they're not really great for cold weather unless you use a base layer underneath. But they meet the needs for what I purchased them for.
I bought these for cool weather FallSpring rides. They have been just right for me for temps down to the low 40's, really comfortable, and the stretch is just right. The stretchy mesh around the knees works really well. I really like the reflective accents which make me more visible at night. I am a slender 6'-0 with a 32 waist and normally wear a medium, but Garneau's size chart lists a small for 32. I tried them but they were too tight, so I opted for a medium which was just right. They really work well over a regular pair of bike shorts. I have ridden about 500 miles in them and they show no signs of wear in the seat area, so they seem like a very good piece of gear.
I purchased these tights to keep the cold at bay and they live up to challenge. Ive used them in the mid to upper 30s and didnt feel miserable. They seem to have good durability and the reflective accents are a bonus. They do run a little tight, Im 58 with 30 inch waist and ordered a small. The length is perfect but they are on the edge where Id almost go with a medium.