Uniqlo
HEATTECH Ultra Warm T-Shirt
F Fiber Grade
Left off the list
35% Acrylic, 34% Polyester, 23% Rayon, 8% Elastane
$34.90 We left this one off the list.
Listing confirmed live Jun 12, 2026.
Why it earns an F
- Only 0% natural fiber, below the 50% floor.
- Dominated by 69% petroleum synthetic (35% acrylic, 34% polyester) and 23% regenerated cellulose (23% rayon).
The exact composition
Body 35% Acrylic, 34% Polyester, 23% Rayon, 8% Elastane
We grade the body or shell, the fabric you actually wear. Synthetic linings or trims are shown here but do not change the grade.