Here's what other sites are saying:
Snow balling up on your crampons keeps your points from penetrating and causes you to loose traction when you need it the most. This problem is annoying at best and dangerous at worst. The Grivel Anitbott Plates for your G12 crampons pop the snow free with each step so you can climb safely.
Grivel G12 Antibot Plate (Fall 2005) Flexible, latex sheets that prevent snow build-up beneath the crampon. The antibott is essential for safety in wet-snow conditions. Latex is the only material that remains elastic and resists cracking in temperatures down to -40 .
Grivel G10 Antibott
Grivel G14 Antibott
Grivel Antibott Add On
$15 - $49
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Grivel G12 Crampon Spare Parts - Front
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Lowe Alpine Crampon Bag