Winter jackets are bulky when it's freezing, and you have to pay for them.
Coolvests are Well worth it. Talked to my neighbor. His 90 year old mom loves working outside, but the heat is too much. She's getting a nice pink, kids' vest. She's a tiny old lady.
Make it the groundies job to get the cooler together, rinse the vests and packs at the end of the day, put them in a little shop freezer/ deep freezer if you have one.
Teach him he needs to drink a lot of water all day, and at night. Lots of guys stop drinking water during their recovery period, then charge into it the next day.
IMO, the pub sounds good, until having to go to work in the heat the next day.
IDK how people can drink a bunch, then do anything athletic. Doesn't work for me.
Almost got mine into the freezer yesterday. I have no natural insulation. Anyone carrying any excess body-fat is more insulated. Someone who's kinda soft is well-insulated. My guy is working his excess off. He's slimmed down a lot from where he started. That extra layer of insulation makes a big difference on a big guy (6'+, 220). The greater the surface are: volume ratio, the easier to dissipate heat.
Groundies are often resistant to laying on the ground in the shade to suck heat off their bodies during a break, and running water over the head, neck, back, arms, etc for cooling. Strange. If I was walking around on terra firma all day, I'd be using the hose to stay cool and sharp.