I wear a Mustang MD 3031. http://image.basspro.com/images/imag...0/23762a-t.jpg It has both manual and auto inflation. Strap back and just the two inflation strips in the front (about 1"X 2-1/2") so it is not too hot in the summer, even here in central Oklahoma & it does get hot. I'm getting older so if i'm on the water, I have my PFD on