Cooling Seat Cushion, Y28°F Desk Chair Cushion Reusable Ice Mat with PCM Cooling Mat Technology, No Condensation, Foldable & Portable Chair Cushion for Office, Camping, Bed, Car

Keep some PCM gel packs in the freezer/refrigerator. It's basically a ice pack made with special salts. Like https://www.amazon.com/dp/B0DYHVVFYR?psc=1&ref=ppx_pop_dt_b_asin_title Put them behind your head or on a major artery. This explain why they work and how to make one. https://www.youtube.com/watch?v=Nqxjfp4Gi0k&t=1004s I use them to cool off after a workout. Put a towel between your body they are cold but you get used to it. In medicne they are used to treat people with heat shock. Science.