The Aonijie F5240 is a lightweight insulated fleece vest designed to provide warmth without bulk, making it ideal for layering in cooler conditions.

Built with PrimaLoft-style synthetic insulation, it delivers effective heat retention while maintaining breathability and moisture management. The sleeveless design allows full freedom of movement, making it suitable for running, hiking, and general outdoor use where core warmth is needed without overheating.

Lightweight and packable, the F5240 works well as a mid-layer or outer layer in mild cold conditions.