What sock fabrics make your feet sweat

Hello good morning all.

This might be the wrong place to start this topic in.

My girlfriend is wondering how do we get our feet to sweat she’s always wearing cotton socks no other sock material in the trainers. Thanks,

Why would you want your feet to sweat!!
Sweaty feet leads to all sorts of foot problems - let alone the bad smell it causes in your footwear - especially trainers.
Most people try to avoid this at all costs.

Because she likes the funky smell in trainers. I know 100% cotton don’t make you smell but not sure why she wants it.