The Oiselle Women's Aero Jacket is a running jacket for cool weather. The fitted Nyelle™ Compression fabric jacket is comfortable with Reflective details to keep you visible in the front & back. A couple of zippered pockets hold onto keys and phone. Slip your thumbs through the loops at the ends of the sleeves and hands stay warmer through the miles. Features: Thumbholes, Abrasion-resistant Jacket Fabric: 88 % Nylon, 12 % Spandex Jacket Length: Hip Fit Type: Slim Fit Insulation: None