I suffer really bad in the winter with cold feet, I had some spare spongy underlay from when my carpets were laid...I cut around my boots for a template and then cut around the underlay...RESULT
Lovely warm feet
hah what an odd way of keeping your feet warm XD makes sense tho! and sounds cheap
cheers prepaday
heres an old trick , wash your feet in very cold water dry them then put on thick socks and wrap them in a blanket / get into bed or a sleeping bag and within seconds your feet will be toasty !