Bouldermatte
engl. Crashpad. Weiche Matte, die beim Bouldern auf das Absprunggelände gelegt wird, um sich bei einem Sturz nicht zu verletzen.

Ground falls are a regular part of bouldering. If you boulder, you’re going to fall. Most boulder problems are short so when you fall, you can get injured. Boulderers do as much as possible to mitigate sprained ankles or broken legs by using a top-rope, crash pads, or a spotter. Spotting, a safety technique, is when a climber on the ground helps break the boulderer’s fall and steers him to a safe landing zone.
If the climber falls feet first, steer him toward the landing zone, usually a crash pad, and let his legs take the shock. If he falls from an overhang, grab toward his armpits and above his center of gravity to rotate his feet down so he lands on them. Watch his head and back so they don’t hit anything. Cup your hands when spotting. Don’t stick your thumbs out because they’re easy to sprain.
http://climbing.about.com/od/bouldering/a/HowToSpot.htm