well, for those of you who care or have an interest..I emailed 40 below with mu inquiries and they responded within the hour..here it is..
Hi Joe!
Love your email address by the way…
Yes this overboot fits on your trail running shoes nicely. They can be used for snowshoes, crampons, micro spikes, etc. However, while they are well made, with strong materials, they are not suited for use on ice, pavement, rocks, etc. They also will get worn and develop holes, cuts, etc with any metal interaction, especially micro-spikes and similar metal traction aids because they have sharp metal points or parts that cut into the fabric, especially on the bottom and lower sides. (not as much with crampons as they have flat decks that the overboot sits on). One nice feature is that they are easy to repair.
We make the Light Energy to be insulative, and as light and compact as possible for superlight snowshoeing. The company NEOS makes shoe covers that have rubber traction soles and are generally more suited for use of walking on dirt, rock and ice trails, traction aid devices, etc. They weigh more and are much bulkier, but work well. They usually will not fit into any crampons.
The Light Energy is made of stretchy closed cell foam, and has 2 different closed cell foam inserts that go under the shoe inside the overboots so you can adjust for different footwear and heat loss. I have attached an article about the use and range of these overboots.
Please check out the info and get back to me with any questions, etc. Love to help out!
Joel Attaway
Forty Below Ltd
P.O. Box 39
Graham, WA 98338 USA
Tel: (253)846-2081 PST
http://www.40below.com
Looks like I will be buying these real soon. Cant wait to try them out!!!