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No. Unless u get really bad quality cheap ones. But theyre not supposed to yellow. And the thing that causes yellowing is generally UV, which skates aren't going to be exposed to.

Been having PPF installed on my cars for a long time now. This looks much thicker, more like the thicker protection films they now use on the rear bumper lips to protect it from taking stuff in and out of the trunk.

Catalogs can be found here:

Claims are very, very specific. I read that sentence as relating to the performance aspect. Editing instead of creating more posts: FDA's statement of the DeNovo submission: https://www.fda.gov/news-events/press-announcements/fda-authorizes-marketing-novel-device-help-protect-athletes-brains-during-head-impacts Relevant research summary of the article: The FDA assessed the safety and effectiveness of the Q-Collar through several studies, including a prospective, longitudinal study in the United States with 284 subjects 13 years or older who were participants on a high school football team. During the sports season, 139 athletes wore the Q-Collar and 145 athletes did not. All participants also wore an accelerometer device that measured every impact to the head sustained during play. Each athlete underwent a magnetic resonance imaging (MRI) scan pre-season and post-season. These MRI scans were used to generate Diffusion Tensor Imaging (a specialized MRI image) of the brain that allowed researchers to compare structural changes in the participants’ brain, after a season of play. Significant changes were found in deeper tissues of the brain involved in the transmission of electrical nerve signals (white matter regions) in 106 of the 145 (73%) participants in the no-Collar group, while no significant changes in these regions were found in 107 of the 139 (77%) of the group who wore the Q Collar. These differences appear to indicate protection of the brain associated with device use. No significant adverse events were associated with device use.