This International Standard specifies a laboratory measurement method for determination of the dynamic performance of cross-country skis. The purpose of the test is to determine the residual camber height and length as a function of the load. Another name for this measuring method is "flattening test". The graphs (for examples see figures 2 and 3) which are obtained according to this test are mainly intended to be used by specialists but may also be of some use for the consumer in selecting a ski with appropriate stiffness. For the latter purpose, two parameters which in a simplified and less stringent way give some of the information obtained by this test, can be extracted from the graphs. These parameters are — the"contact load", which is a measure of the minimum load necessary to bring the centre part of the ski in first contact with the snow. If the ski is loaded with a higher load than the contact load, the frictional properties (during gliding and kicking) of the centre part of the ski will influence the ski behaviour significantly. For lower loads, the central part of the ski base will have a minor influence on the friction ; — the "standard camber length", which is a measure of the length of the ski base which is not in firm contact with the snow during gliding when the body weight is equally supported on both skis. Note that in extracting this parameter, a normal average weight is assumed for the skier. This parameter has special relevance for skis designed for use of wax as a kicking aid (especially on wet snow or ice). Note that the best values of these parameters depend on several factors, such as the skier's weight and skill, snow conditions, ski construction, base structure and preparation. It is therefore recommended that the ski manufacturer for each type of ski supplies information on how to use these parameters. As a consequence, the values of the parameters measured in this test cannot be directly related to the quality of the ski. This International Standard is applicable to cross-country skis of size 130 cm and longer.