I'm a Simple Guy Shirt Size:2X-Large while the low-profile form factor

while the low-profile form factor fits easily under most jackets

The 2mm neoprene shell is warm

D30® Viper 1 CE Certified Removable Back Impact Protector - EN 1621-2:2014

or the Dual Bluetooth controller that features a "set it and forget it" temperature control technology (measures the internal temperatures

I'm a Simple Guy Shirt Size:2X-Large while the low-profile form factorFeatures: 100% Cotton Full Cut Full Length Tee Front Print Only Metallic Purple Ink Proudly Printed In The USA SHORT SLEEVE MEASUREMENTS IN INCHES I'M A SIMPLE GUY SHIRT SIZING CHART SIZES MEDIUM LARGE X LARGE 2X LARGE 3X LARGE CHEST FULLEST PART OF CHEST AROUND 40 42 44 46 48 50 52 54 LENGTH SHOULDER TO WAIST 28 29 30 31 32