You may have noticed that I have a predilection for snow landscapes. They bring a certain minimalism to my compositions. As someone who has photographed in snow for many years now, I've always found it hard to keep my tripod from sinking so deep into the snow that sometimes it's much lower than I intended.
When I extend the legs (one of the many reasons why I choose to use a very very tall tripod) I can sometimes get round this issue and have the tripod at the height I want, despite the legs having sunk so far into the deep snow that it is often difficult to position the tripod exactly where I want.
On all my Gitzo tripod purchases, they have always come with an accessory bag that contains the items you see above: alen key's for tripod maintenance, grease for re-greasing the tripod after a major shoot (you should disassemble and strip down your tripod after it being in salt water at the very least and strip it down regularly to keep it working like new).
The bag also comes with some snow shoes. They look a little like the shoes that are at the bottom of most ski poles. I've found them in general to be an improvement on not using them at all, but they are still not ideal. They do not allow me to really get some kind of floating for the tripod.
I've been looking around the web to see if someone makes some decent show shoes for tripods. It appears that this is either a major oversight by tripod makers, or that perhaps the market is so small that they haven't bothered.
I guess I may have to go and design my own.