Solemn is one of the most habitable exoplanets discovered, but it is not without its environmental hazards. in particular, temperatures ranging from freezing to literally boiling. As part of the Solemn Initiative, Argonaut work-groups have designed a biological alternative to hazmat, vacc, and combat suits. Skin-suits are all those in one package, but have yet to catch on.
Skin-suits replace not only combat armor, but act as environmental protection against dangerous gasses, non-breathable atmospheres, high and low temperatures, and allow for digestion of a greater array of foods. In fact, the suit effectively takes over a number of the body's tasks, using a feeding tube, breathing mask, catheter, colostomy, and associated recycling systems.
The suit designers have done their best to shy away from biohorror; from a distance the suit looks like tight leather with protective sports gear. Looking closer, however, reveals that the "leather" is a living hide, and that the helmet, knee pads and other extra protection is chitin, melded into the hide. The face is minimal, as early attempts to maintain a human face fell deep into the uncanny valley. Instead, the mouth is almost invisible when closed and the ears and nose are simply small openings. They eyes are large, blank and reflective, looking like insectoid sunglasses.
Skin-suits are armor [Expensive]
A skin-suit provides 11/11 armor (equivalent to carapace armor, stacks with bioweave), as well as purifying air to human-tolerances (equivalent to enhanced respiration), providing improved insulation (equivalent to temperature tolerance) and expanded options for sustenance (equivalent to digestive symbiotes).
The primary variant is designed for vacuum (with vacuum sealing and oxygen reserves). Medichines are also common, as the suit can be healed just like a morph, but requires a special variety, and does not benefit from the medichines of the morph wearing it.