Part of the USMC FROG (Flame Resistant Organizational Gear) Program, this next-to-skin underwear layer is designed by XGO and made by various government contractors for the military.
The undershirt is a mock turtleneck undershirt with long sleeves and self fabric cuffs. The underwear is in a silk weight modacrylic/rayon blend material. The fabric is quick drying, moisture wicking, and includes antimicrobial properties.
They provide improved moisture management and comfort when worn in intermediate to cold weather environments. In addition, it will provide FR protection when needed. The FR Silkweight Underwear can be worn as part of the Mountain Cold Weather Clothing System (MCWCS) or Flame Resistant Organizational Gear (FROG). Replaced by Coyote version.
Use the chart below to determine the best sizing for you. If you think you could be in-between two sizes we recommend: for a more athletic/tighter fit, ordering the smaller size; for a more relaxed/looser fit, order the larger size. For those who have a broad chest with a smaller waist, we recommend ordering the size based upon your chest measurements.
Below are visual representations of the types of fits XGO offers. How a product fits is annotated in the product description of each product.
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