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BG381225218 Howaccurate did you find the sizing?

ASm73 06/11/2019
This vest has three temperature settings controlled by a push button at the upper left. Temperatures cycle between low, medium and high indicated by a white, blue or red led. There is no off choice, the vest must be unplugged from the power source to turn it off. The vest draws 1.4 amps at 5 volts. Temperature is controlled by pulsing the power on and off. Pulses are at about two second intervals for low, one second for medium and continuously on for high. The vest is made of a slightly elastic, rubberized material which feels something like a diver's wet suit. It is lined with a soft, plush like material. This is the first zippered garment in my experience with the zipper pull on the left. It works normally, but feels clumsy to use. On a 27 degree (F, -3C) morning, I wore an undershirt, the vest, a heavy shirt, and a light nylon windbreaker in that order. I could not wear the vest over the shirt as it was too small. I am 5' 11" (180 cm) tall, weigh 190 pounds (86 kg) and have a 36" (92 cm) waistline. Although I ordered the largest (3X) size available, it lacks 2" (5 cm) to close easily over just a undershirt. Being somewhat elastic, it will zip up, but fits me very snugly. However, it is not uncomfortable although snug. I would be afraid to try to zip it while wearing it over my shirt for fear of damaging the internal wiring. At the lowest setting I was quite comfortable while walking. If I stopped, I would be conscious of the vest's warm areas; when moving, I didn't notice them. An hour later and after sunrise I became overwarm. I would estimate that the air temperature was up to 34 F (1 C) and I unplugged the power source. About 20 minutes later, I became overwarm again - the vest is a good insulator. I had to unzip it to remain comfortable. How this vest will hold up in regular use remains to be seen. However, it works very well.. Recommended as an excellent value IF CARE IS TAKEN IN SELECTING SIZE.
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