Description If youâre considering the versatility of a shirt jacket, look no further than THE ONE SHIRT-JAC. With highly breathable, temperature-regulating performance, THE ONE provides lightweight warmth ready for any adventure. Our articulated design features built-in stretch to provide superior flexibility and fit for an active lifestyle.Aero knit insulation in a casual snap-up shirt-JacSuperior stretch for freedom of movementKnit underarm gussets for temperature regulationMikro Air Stretch fabric is sleek, soft and water-resistantArticulated patterning with an athletic fitAeroKnit | 100% Polyester | 110 GSMMikro Air Stretch | 100% Nylon Taffeta | PFC Free DWR | 54 GSM69% Nylon, 31% Elastane | 200 GSMApproximate Garment Weight: 340 G | 12 oz.