This is a GRID TECH turtleneck, rumored to be warmer than Heattech. I'm selling it because I ordered the wrong size. I only tried it on once. (It has been washed, just in case) I'm using the replacement I bought, and it is indeed warm. The thumbholes are also a nice feature. It has high elasticity and heat retention, making it useful as an inner layer from mid-winter to early spring. The grid-like fabric has a brushed surface that feels warm and comfortable against the skin. The thickness is just right, thicker than regular Heattech but thinner than waffle fabric. It's comfortable and doesn't feel sticky even when you sweat. Shoulder Width / Body Width / Sleeve Length / Length Shoulder Width: 42cm Body Width: 45cm Sleeve Length: 62cm Length: 63cm Color: White系 (White-based) Sleeve Length: Long Sleeve Pattern/Design: Solid Stains, tears, odors, etc.: None