If you are at the upper end of the Taktrax size range listings and will be wearing large boots like winter Sorrel pack boots, you may want to go up one size. For example, I wear a men's 10.5 shoe so the regular sizing says the medium goes up to size 11. But with the pac boots you really have to stretch them hard to fit over the soles, so I got a large for those boots as well as a medium for regular shoes.

Do these work well to run with on concrete sidewalks that are partially clear with snow and/or ice remaining only in spots?

When they were originally made in Boulder, Colorado, I could run 2 dogs every day for 1-4 miles and get at least one winter and part of the next on mixed ice and pavement. When they off-shored the coils compressed then wore down and rusted and the rubber fatigued within a week or 2. In other words they increased their profit margin by turning the product into trash by using a lower grade of steel and spacing the coils further apart. So it is possible but not when the investors are too greedy.

No size chart? What size is women's 8-9?

I wear a Women's size 8. The manufacturer sizing information on the box, says for U.S. Women's Size 8, get a SMALL YakTrax. I have KEEN winter boots,size 8 medium. Keen's winter boot have a substantial heavy sole. There is no way that I can stretch the YakTrax Size S onto the KEEN boots. A medium would fit (but I haven't tried yet). The YakTrax SMALL just barely fits over a pair of "fashionable" winter boots, size 8, that have a dainty-sized,or thin sole. I suggest that you take your boots into a store and fit the YakTrax on before purchasing. If the stretch is too tight, you'll know right away (it'll strip off your nail polish and split a nail or two attempting). Be careful during the stretch 'cause it's like a sling shot! It can take an eye out! :) You want a YakTrax size that's easy enough to take off when you go indoors because on stone floors, these are slippery and on carpet, they will rip up the carpet. The manufacturer sizing information is misleading.

Getting for a woman who is 73 and in pretty good shape. Would you recommend for her?

I have owned these for two years but really put them to the test today. Even the snow was coated with ice which did not collapse under my weight, but I was able to easily walk with them! I am completely impressed, but I agree with not wearing them indoors. After my elation at not falling on the ice and seemingly doing OK walking on a tile floor in the Metro station, I fell when stepping off the train onto the same tile floor. I stayed on the floor and removed them before preceding on my way. I am an "older lady" and think these are great for anyone. They pretty much require you to sit down to put them on, however, or maybe you could put them on most of the way and then put on your shoes. I have not tried that method yet.

Global Trade Identification Number	00096506086112
Item model number	8611
ASIN	B0094GO6ZG

Pro Traction Cleats for Snow and Ice by YakTrax

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