Quite a few companies are doing single layer jeans these days, often with CE approved slide times equal to or higher than leather. Resurgence now do a single layer with a tested slide time of around 11 seconds :surprise:
I wear Resurgence Cargo Pants pretty much all year. Basically it is a 100% inner trouser made of Aramid and UHMWPE mix they call PEKEV. Kevlar and Dyneema are examples of these materials. With a simple cotton over trouser stitched to it. Add D30 protectors and there it is.
Yep they are a bit warm occasionally in Spanish High Summer. And are not even marginally Damp-Proof.
This provides astonishing slide times. Good joint impact protection and - something single layer fabrics cannot do - cushioning for areas not covered by protectors. This cushioning is also something that good leather naturally supplies.
Single layer gear tends not to protect as well from the friction heat during the slide. That said the coefficient of friction may well be lower depending on the fabric used.
Aramid single layer tends to be warmer - Dyneema single layer can even be classified as chilly.
I would encourage you all to reap up on the material properties of the Aramid and UHMWPE families of products. Aramids degrade VERY FAST when exposed to UV - UHMWPE is not ideal close to extreme heat. Aramids also absorb moisture.