This is the genuine RFI Issue gear being issued to troops.

Base Layer: Worn next to skin by itself or in conjunction with other levels for added insulation and to aid in the transfer of moisture.

The GEN III ECWCS Lightweight Cold Weather Undershirt are designed to provide warmth without weight.

Constructed with Polartec® Power Dry® Silkweight material, this next-to-skin layer is highly breathable, wicks moisture away from the skin and dries fast. Flat-locked seams and cover-stitched hems have been added to reduce chafing and increase comfort during movement.

The Level I Undershirt has a crew neck, a contoured long tail in the back, and long sleeves with thumb holes to aid in donning multiple layers of clothing over the undergarment.