I have found a coupon code on the page listed below, it brings the price down to around $8 (68% off it must be), which is much more reasonable than the original. Check reviews for some details about them, for the price they should be good enough for a winter season. They seem to be running on a bit larger size, see reviews.
DKH4YMHQ works for all colors and sizes
Description from the page:
Closed-back style make it soft to drive cars or cozy while you stay at home.
Made of high quality soft gentle fabric, you can wear it for a long time as good as new.
Durable and anti-slipping rubber sole protects you from slipping. And it make your feet off the ground in warmth.
The construction is strong enough,confirming its arch support.
Perfect for Brithday Gift or just casual wear