BMW Genuine Motorcycle PCM functional underjacket 2 - L BMW Genuine Motorcycle PCM functional underjacket2 Two-piece undersuit -- Mandarin collar made from fleecy thermal Powerstretch material -- Powerstretch outer -- Phase Change Materials (PCM) for chest, upper arm, kidney area, thighs and knees -- Breathable, temperature-regulating and quick-drying -- Designed for temperatures between 5C and 15C -- Phase Change Material becomes soft when worn -- Also ideal for skiing, jogging, hiking, etc.