While these look like fun and kids want to be cool by using them, they are DANGEROUS. Even patently UNSAFE. Ski Patrol call then 'bone yards'. Ski Areas do not design or man them for safety. See this video....
Seven Point Responsibility Code, from the Ski Industry ...
Jim Wilson Story; Subdural Hematoma
HAPE story from Beth Staples
Terrain Park collision avoidance Injury
Avoidable late day accident, broken neck
SIS snow immersion suffocation
Mixing snow sports and substances is a recipe for calamity. Period
And it is Illegal to be under the influence of either chairlifts or ski runs. Also Illegal to use POT on USFS land, that means 95% of COLORADO SKI AREAS