Made of a very soft fabric which stretches in all directions and moves freely throughout your workout. I've not worn anything that feels as flexible and comfortable as this before, having tried many other mainstream and technical brands.
They almost feel like you are not wearing anything at all and they are also a very thin fabric.
They offer good coverage squatting, but are always a little revealing in the crotch.
They feel nice and warm during cooler months, but during the hotter months, can get a little warm. Despite being so thin, they don't feel like they breathe much, however they wick the sweat away quite well.
I would happily buy more and in different colours. I think Decathlon should start making most of their compression gear with this fabric, it's incredible they are making this so affordable.
Only thing I would change - they come up very high waisted and so the waist rolls over during workouts. Since they are so soft, it's not too uncomfortable but some people may find it so.