This is such a great product. I had ordered the medium size, but ended up giving it to a friend that has MS and could not walk her 2 dogs. Now she can and loves it.  I highly recommend it. I have carpal tunnel and am a bit uncoordinated :-)  I kept dropping the leash so much that I thought I could not walk my dog any longer. But after I bought this, well, lots of walks. I bought the extra large size so my 85 year old father could also use it and at times walk my dog. He is much larger than me. The extra large can be made much smaller so it fits me also. Great product.  I am now thinking of buying an extension so my dog can at times wanderer more.  At this time, we connect another leash to the system to give her more length... and that works great also.