Can't remember the make without looking in tack room,! My son got a pair at hoys last year in red, they r expensive think I paid £ 78 but they are light and do help him keep his foot in right place.
I use the Freejump stirrups (the ones on equiport) , they are amazing to ride in and once youv'e ridden in them you won't want to ride in anything else. Your lower leg becomes so stable and they make it near on impossible to lose your stirrups, plus the safety stirrup design prevents any risk of being dragged after a fall and I have a very dodgy right ankle after severe ligament damage and after riding 6 horses I don't have any pain if I have used these as so supportive. Yes they are horrendously expensive but totally totally worth it! They come from netherlands and are a bit cheaper if you order them directly from here- http://en.freejumpsystem.com/
I use the Reflex ones. Cost me £20 off ebay and they are brilliant. Great for security and sore knees are a thing of the past.
However - the big name sellers have cottoned on to how good they are and have hiked the price by a whopping 60% but you can still buy them cheaply if you search the net, like here: http://www.happytack.co.uk/german-pfiff-black-reflex-shock-absorber-stirrups-332-p.asp