They're really lightweight but they also have polycarbonate layer to protect the tendons. I've noticed when I've used them that they don't get as sweaty as some boots. I school everyday and with a yard of quite a few I'm lucky that these boots fit many of my horses they also can be used on both front and hinds. Another recommended purchase and a good addition to any training or competition wardrobe for your horse!
http://www.dragonflysaddlery.co.uk/addtocart.asp?categoryid=11&subcatid=206&hr=h&categoryname=Boots&subcatname=Sports+Boots&itemid=1712
Thanks to Les Brown of Topham Brown Photography who took some great shots below of them being worn in training!
http://www.topham-brownphotography.co.uk/_/Welcome.html