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Mobile Warming 7.4V Men's Primer Heated Baselayer Shirt

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Mobile Warming 7.4V Men's Primer Heated Baselayer Shirt

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The Fieldsheer Bluetooth-Enabled Primer heated baselayer shirt is designed for the outdoor enthusiast. From skiing, hunting, hiking to running or just working outdoors, the Primer Shirt complements your outerwear to keep a warm core. Its moisture-wicking, warmth, and stretch features make it a versatile heated baselayer in the winter, or a standalone shirt during outdoor activities in the Spring and Fall. The Primer is made from a 4-way stretch anti-microbial polyester-spandex blend that provides a comfortable next-to-skin feel. Flat-lock seams, moisture-wicking mesh liner, and side-stretch panels conform to your body and allow for maximum body movement. The Primer heated baselayer has integrated, concealed heating panels powered by sturdy yet lightweight 7.4-volt Mobile Warming heating system. The 7.4-volt system has 3 heating elements, one on the back and 2 on the chest, that add heat to critical areas that keeps your core warm for hours. The Primer's 7.4-volt heating system can provide temperatures ranging from 135F on high to 90F on low. On high, expect 2.5 hours of heat, and on low, the Primer can provide heat for up to 10 hours! The Primer has 2 ways to adjust the temperature. First, the built-in touch control button. With a simple button push, you can select from 4 heat settings. Second, we've incorporated Bluetooth control with our MW Connect app. Through the MW Connect app, you can quickly toggle through all connected Mobile Warming devices and adjust individual heat levels to your liking. MW Connect allows you to get real-time updates on battery levels and update your garments when new firmware becomes available. All day, any weather. The Primer heated baselayer shirt is a versatile insulating layer that keeps you warm all winter long.


  • Stretch Polyester Fabric
  • 88% Polyester, 12% Spandex
  • Moisture-Wicking Mesh Liner
  • Chafe-Free Flat-Lock Seams
  • Mesh Sides
  • Anti-Microbial
  • Anti-Static
  • 4 Selectable Heat Settings
  • Bluetooth 4.0 Wireless Control
  • MW Connect Mobile App Compatible
  • Integrated Touch Control Button
  • Tri-Zone Heat Elements
  • Powerful Rechargeable Lithium-Ion Battery
  • Up to 10 Hours of Heat Per Charge
  • Battery Rating: 7.4v, 2200mAh
  • Charge Time: 3.5 hours
  • Available in SM, MD, LG, XL, 2XL & 3XL


  • (1) Primer heated Shirt
  • (1) 7.4-volt 2200mAh Lithium-Ion Battery
  • (1) Micro USB Cable

Mobile Warming products are designed with the outdoors in mind; the range of applications is wide-spread including skiing, hunting, hiking, fishing, motorcycling, golf...even work. Breakthrough technology provides outstanding levels of comfort and warmth for an entire day at the touch of a button; exceeding the efficiency of any other warming system available in outerwear today. Mobile Warming is committed to continuing to provide customers with the best quality, best priced, and best performing heated products on the market.

STAY WARM, STAY COMFORTABLE Industry Leading Heat Performance

Patented Mobile Warming technology is specially engineered for cold environmental conditions. Mobile Warming comprehensive heating solutions keep you warm and comfortable. The exclusive Mobile Warming heating system utilizes F.I.R. (Far-Infrared) heat and ultra-fine metal fiber heating elements powered by lightweight, rechargeable, and powerful Lithium-Ion batteries. As heat builds Mobile Warming advanced materials reflect and direct heat back towards the body ensuring that you stay warm. The combination of unique materials, construction techniques, and innovative design results in the most advanced heated gear available.

Product Reviews

Review Summary
3 Reviews
67% (2)
33% (1)
0% (0)
0% (0)
0% (0)
100% Recommend this product (3 of 3 responses)
By Rick
Works great
December 22, 2023
So far, this seems like a great addition to my ski gear. It is cold in Maine and and I am not getting younger; this is adding hours of comfort to my ski day
  • Base layer so it is right on the skin.
  • Bluetooth makes it very easy to adjust.
  • Nice slim battery that seems to last.
Heat for hunting
October 9, 2022
I bought this shirt a few times for hunting. My first one I put in the dryer and broke it. So make sure you air dry these. My second one that I’m on is still working. I love the small and powerful batteries and the location of where they are on the shirt, on the rib cage out of the way. I have two complaints. On is where the button is. It’s at the bottom of the shirt. So if I tuck it in it usually gets turned on or changes temperature. The other is I wish it was a little longer so if I do tuck it in it’d stay tucked in.
  • Great battery life
  • Great battery location
  • Really warm
  • Love the bluetooth ability
  • Awful on button location
  • Needs to be longer so it stays tucked in
By Berdell
Great Gift
January 1, 2022
Comfortable and functional.
My husband loves wearing his warming shirt to my son’s baseball games.
  • Comfortable and machine washable