Actually, I didn't really know what to expect with the size because I'm a man and these are women's sandals. A size 9 Keen fits me perfectly and I found a conversion table online that indicated women's shoes are 1.5 sizes higher than men's (Why the heck this is, I'll never know), so I took advantage of the new "Prime Wardrobe" feature (more on this later) to order two pairs of Keen's women's sandals. To be on the safe side, I ordered one pair, women's size 10.5 (These, the "Crabapple model) and another women's size 11. The size 11 sandals were only slightly too long and the size 10.5 were slightly too narrow, so the conversion rule isn't perfect; but only "slightly" off. As I know these shoes stretch, slightly, with wear, I went with these 10.5 shoes and returned the others

I love these sandal/shoes by Keen. They are comfortable, colorful, and very well made. I wear them year round, but they are particularly great in the summer because, like flip-flops, they allow your feet to breathe and stay cool, but remain in place and present no problems in term of walking or running. I already have three pairs and I've been on the lookout for more. They are by no means as cheap as flip-flops so I can't afford to indulge myself with other shades of blue, green, and brown (and Keen offer a wide variety of these shades plus other colors) so I've been looking for distinctly different colors. This Fig/Crabapple model caught my eye because of the color which is a little more of an orange shade than the pinkish shown in the photo (A good thing IMO). The problem was it is only offered in a woman's model. While there may be a difference in the design of Keen men's sandals and their women's version, I can't detect it, so it really only came down to the sizing. 10.5 isn't perfect, but if they stretch only a little bit, it will be. I don't foresee using my new found knowledge of shoe sizing to purchase a lot of womens shoes for myself. For me, at least, its only applicable for shoes or sandals that are basically unisex to begin with and I think these Keen sandals are just that.
A word on Prime Wardrobe: I assume, by the name, that it is only available to Prime Members but if you shop with any regularity you really do need to become a member. You will recoup the membership fee on shipping costs savings alone, plus you receive all sorts of great extras. Now Prime Wardrobe is one of them and it too is great. Briefly, you can order up to 8 articles of clothing and have them shipped to you within a few days. You pay ZERO $, and this applies to shipping too. After the items arrive, you have 7 days to try them on for size, judge the colors and designs in the real world, and do just about anything else you might normally do when shopping in a bricks & mortar retail store. If you want to keep one, more or all of the items, you don't have to do anything (although Amazon requests you go to your online order and indicate your intent to keep them) Whenever you advise Amazon you want to keep one or more items, or after seven days from receipt, you will be billed at the item's price at the time of your original order. If you decide not to keep something you simply return to the original order and indicate you are returning it. Doing so is a breeze. The items are shipped to you with a prepaid return UPS label and the box the items arrived in has a resealing sticker attached. All you have to do reseal the box (with the returns inside :) ) slap on the label and drop it off at your nearest UPS store. At no point is there any cost to you.

Obviously the returned items can't be damaged or display obvious wear and you are supposed to return them in their original packing, but these are hardly unreasonable requirements. This is my first use of the feature and so I can't report on whether or not the return smoothly finalizes, but I've no concern that it won't. Amazon may have thought, when putting this feature together, that some buyers will not get around to returning goods they don't really want and will end up paying for them, but I don't think its, at a major concept for them. I know this is a motivation of other retail sites that offer this sort of "Test For Free" feature but the one's I've seen, charge your credit card upfront and issue a credit when the returned goods are received, and/or make it unnecessarily difficult to return any items. This is definitely not the case with Amazon. Pretty sure that their primary motivation for offering this feature is to capture sales they might have been losing because the buyer wasn't comfortable purchasing items without a test-run. Unless something goes bad with the return (which I don't at all expect to happen) there is absolutely no trickery involved with Prime Wardrobe. I intend to use it all of the time from now on.