 Others include Perma-snow by John Nike Leisure/ Techmat 2000, also in the UK and Astroride by NorCal Extreme Sports in the United States.Snowflex and Perma-snow are both white in colour, although the former has been produced in a darker green (such as in Kendal Ski Club in Cumbria, England) to comply with planning requirements.There is no indication from NorCal Extreme Sports that AstroRide has been commercially tested to any great extent.