Are you looking for an easy way to keep your toes warm on your winter bike rides? The toe covers and shoe covers sold in bike shops are designed to fit over your cycling shoes and they work great. However, if your toes are still cold you ought to try a pair of Neoprene Tip Toe Covers by the Gator Sports.
Tip Toe Covers are designed to be worn inside of your shoes—either under your socks or over them. I think the best way to wear Tip Toe Covers is over a polypropylene sock liner and under your normal winter cycling socks. The polypropylene sock liner will wick moisture away from your skin while the neoprene in the Tip Toe Covers will help keep the heat in. Tip Toe Covers are very lightweight and stretchable, which is a good thing since they only come in one size (one size fits all).
After having used Tip Toe Covers on numerous cold weather rides this year it seems to me that they warm up my toes about 10 degrees more than than they would be without them. Tip Toe Covers are not the only cold weather gear your feet need, but I think every cyclist ought to own a pair. Neoprene Tip Toe Covers sell for $9 a pair on the Gator Sports Website, and I am certain you will find them very useful on cold rides.