What's the material used on the footbed of these slippers?

I am very happy w/ how cool these slippers are in the summer! To answer your question see bullet #3 of description: Breathable & Sweat Free: Skin-friendly cotton waffle cloth on footbed and lining allow great breathability, effectively absorbing sweat and preventing odors to keep your feet dry and fresh, making these bedroom slippers an ideal choice for everyday wear.

Do they stretch out? Seems whatever I buy for slippers they stretch out and can't keep them on my feet😪

I haven't had the slippers too long yet but it doesn't seem that this material will have much stretch to it. I agree, most slippers are hard to keep on your feet unless they come with a velcro strap that can be adjusted to the foot. These slippers are pretty but if you're not "surefooted", they could be a hazard if you're older or have vision problems..

Are these true to size or should i size up from a size 8?

I wear a 9 1/2 ordered the size 10. Fits perfectly. They are adjustable if too big.

Are they made in the USA?

Hello, I'm not exactly sure where they are made. But I believe the company is located in India. And they seem to be "a woman-only portal to help startups by providing a list of job-ready candidates who match their on-demand hiring requirements. The company was founded in 2021 and is based in Bangalore, India."