MERRIMAC Men's Slip-on Slippers Comfy Memory Foam Non-slip Indoor House Shoes

Can you wear these without socks on, without them smelling after? I just want slippers I do t have to wear socks with 😩

What size would be best for someone who's a 8.5?

Can these slippers be washed?

Ordered slippers at the begining of December, still not received them. How do I get a refund?