One look at the box and it becomes pretty obvious, what it's used for. Here is the concept, you slide it on your foot, like an ankle brace(it really looks like an ankle brace). Then you take your favorite "o-ring compatible" dildo and connect it to the ankle brace bit.
Here is a nifty video Attaching the Heeldo
After the dildo is attached, you squat down, inserting the toy and ride. It seems to be compatible with anal or vaginal entry. It really gives the phrase "Go fuck yourself" a whole new spin. But, you can also change the configuration a wee bit, and use it to penetrate your partner as well.

The material this device is made of is primarily neoprene. The straps are nylon and it comes with 3 rings, 2 stainless steel and 1 rubber. The materials actually feel like they are quality made and will last a good while. the Neoprene foot harness has a slight odor, but no more than my knee brace did when it was new. (Besides I don't know of too many folks that can put their ankle to their nose anyway.) The foot harness with all the straps and bits attached is actually quite soft and comfortable to wear. I don't know that I would call this toy water "proof" but certainly water resistant.

As mentioned above the design and craftsmanship is really high quality, the neoprene foot harness is really comparable to a good quality "brace" that you wold buy at any drug store. And the straps and fasteners feel like they would last a while through many uses, and they are very adjustable. The only thing I see that may be any type of issue are the snaps that hold 2 of the straps in place. They seem to come undone easily. But there are 4 snaps(2 on each side) and during the few uses I tested this toy, only 1 of the 4 snaps came undone. Three o-rings come with the harness each of a different size so this harness could work with several different toys, so long as it is o-ring compatible. What IS o-ring compatible? Pretty much any toy that has a wide base at the bottom. Like this little guy.

As far as the size goes, I was fortunate that the good folks at Eden sent me a Large/XL unit. Otherwise my size 11 foot, might not have fit in it. And you know what they say about guys with big feet...big shoes. Anyway, the Foot harness sleeve was a little snug but no uncomfortably so. And the straps that hold the toy are very adjustable, pretty much universal. I believe the manufacture will offer 2 sizes, that should fit most.

This toy performed very well, once I put it on my ankle, strapped one of my favorite dildos to it, I found it was very easy to insert anally and "go to town". It also stayed in place really well during use. On another occasion, I put it on my wife, and strapped on her favorite toy and she was able to put it in (vaginally) quite easily and ride it to. She was also able to reach her clit with a vibe while she rode it...it was fun to watch, and then I realized. "Hey! her mouth is available for..." well, I digress. Anyway, the toy's over all concept is pretty neat, it comfortable to wear and for the most part easy to put on and take off. Although the first time, it may take a bit of feeling it out, to get it on right. But the video link above really shows how to wear and put on pretty well.

And speaking of videos, you wanna see this toy in use(graphic content)? The Heeldo in action

Being neoprene, this toy overall is pretty easy to care for. If it should become soiled during use, just rinse out and set to dry. I would speculate that you could even throw it on the washer(but NOT the dryer). and once it's clean and dry it stores easy in a zip-lock bag, or its original box.

the products packaging, like many sex toys, is not discreet by any means, one quick glance and it's obvious that this is a sexual device, or "novelty" in some states. However the packaging does provide some useful information, on how to use the device, which is good because there are no instructions IN the box. Also, the manufactures put the toys website www.Heeldo.com right on the front of the box, and the website has a bunch of useful information. Also, the toy seems to store well in the box it came in.