Back in stock (Jan.25). This is a unisex-sized, synthetic, short sleeved product. Based on size chart, ordered a Small. Am a 5’6″ female, 118 lbs. Sizes seem to run large/wide; long. You may wish to read their website for other options(sleeve length, fibers). Wear frequently, in winter, under other garments.
Worn  a white fishnet singlet  under cycling jersey for decades. Light.
Also worn for kayaking, all paddle sports; hiking
Strengths:
- Light, easily foldable
- Easily laundered; suggest cold water, gentle detergent; hang dry
- Able to wash in sink during travel
- Seems to keep torso warm
- Recommend you NOT use fabric softeners or tightly wring
- Unique product
- Does not restrict movements
- Good layering garment
- Comfortable-does not itch, other than labels
- Reinforced shoulder areas
Limitations
- Fragile
- Must wear undergarment if concerned about modesty.
- Must gentle wash and highly recommend gentle detergent, smooth hanger to hang dry
- There are two (2), sewn in back neck hem area, labels which irritate and  hard to remove without damaging garment.  Kinda stupid!
- The label in front is sewn  in a non- irrating  position, but advertises garment.
- Limited color options