Bought the Cool Sport Motorcycle Cooling Vest.
It's discussed in earlier postings.
Cotton vest with two front and two rear pockets
that each hold a phase change material (PCM) cooling pack.
The PCM packs take about 20 minutes to recharge in ice water,
about an hour in the freezer.
Bought two sets of PCM packs.
One set to wear and one set to recharge
in the cooler on my Bushtec Quantum trailer.
Works for about an hour or more per charge.
Only a few minutes to swap out.
Have kept the spares in a small cooler when not pulling the trailer.
Comfortable, but a little bulky.
Later, bought the Chill Out evaporative vest.
Shango Rider had it at the GA Mountain Rally.
Bought the cowboy-style vest since it was shorter than the unisex vest.
Comes with a big plastic bag.
Fill with some water, soak the vest for about ten-fifteen minutes.
Even better, if you add ice.....
Wring out excess, if desired.
Feels about fifteen degrees cooler than ambient temp.
I use it under my RevIt Air Force or BMW Venting Jacket.
Not as cool as a PCM jacket, but easier to use.
Unlike the PCM, expect to get a little damp.
I like it since it takes up less room (vest + plastic bag).
When you stop for a beverage and bathroom break, get a beverage.
Add water and ice to the bag, soak the vest,
By the time you've finished the beverage,the vest is ready.
Haven't tried the Silver Eagle vest.