Went looking for a largely endurance ride with some heat acclimatization, and be careful what you wish for. Prehydrated with >500 mL of water. Stiff tailwind out again, which was nice enough. As expected, the temps went up. Mostly under canopy and had shelter from most of the headwind coming home. But the heat was really getting to me in the last hour: I got those alternating feeling of cooling and overheating. Could have used one of those ice socks that the pro peloton puts down their backs on hot days. Probably could have drunk more, but that didn't seem like the issue: it's just a matter of spending time in the heat. What fun. Broken clouds, 79°F, Feels like 78°F, Humidity 74%, Wind 15mph from SW - by Klimat.app 43.69 ft/mi, 0.95 moving/total time, HR (avg/max): 143.6/170, Power (avg/max/NP): 141.7/595/178. Thanks ActivityFix.com!