Outdoors in- 10F and shoveling snow proved I essential help. What a blessing these gloves have been! No extra chilly hands as these gloves give me just what I wanted. I'd very suggest the Extremely flex gloves. But there should be directions on the particular vest. Otherwise, consult the https://who-makes-alpha-heater50594.jts-blog.com/31093849/the-basic-principles-of-hottest-heated-jacket