This document specifies performance and safety requirements for constant wear suits and suit systems for professional and leisure activities to protect the user against the effects of cold-water immersion, by reducing cold shock and delaying the onset of hypothermia.

If a suit system includes a personal flotation device (PFD), it provides protection against drowning.

This document is applicable to dry and wet constant wear suits and suit systems.

This document does not apply to abandonment suits. Requirements for abandonment suits are given in ISO 15027-2:2026.

Test methods for immersion suits are given in ISO 15027-3:2026.