These booties are designed to be worn over your boots for extra warmth while snowshoeing. They can also be worn over your boots and then overboots over that for a really warm snow camping combo.
These booties are about a size Medium, they would best fit over boots in the size 9 to 10.5 range.
More info here: http://crescentmoonsnowshoes.com/product/booties/ The ones for sale have Velcro loop strips rather than a larger patch shown in the image.
MSRP is $47.50, sell these for $30 plus shipping. No PMs please, email me direct at willi_wabbit at bresnan dot net, and include your zip code to calculate shipping.