Sizes in Japan may differ from those in other countries, so please check the size chart carefully before purchasing.
 
 
The HEATTECH Extra Warm series offers approximately 1.5 times more warmth compared to standard HEATTECH, based on CLO value (a measure of thermal insulation). The inner layer is made with cotton for a soft, skin-friendly feel, while the fabric's ultra-stretch property ensures comfort and easy movement. The surface has a cotton-like appearance, and the slightly relaxed fit allows it to be worn comfortably as a T-shirt.
Key Features:
About 1.5 times warmer than regular HEATTECH.
Soft, skin-friendly cotton inner layer.
Ultra-stretch fabric for excellent freedom of movement.
Cotton-like texture with a relaxed silhouette for versatile wear.
Absorbs and releases moisture to reduce stuffiness.
Equipped with antibacterial, odor-control, and deodorizing functions.
Material:
[03 GRAY, 38 DARK BROWN] 52% Cotton, 34% Acrylic, 7% Rayon, 7% Spandex
[Others] 52% Cotton, 41% Acrylic, 7% Spandex
Care Instructions:
Machine washable (use laundry net)
Do not tumble dry