Uniqlo HEATTECH: Versatile Thermal Layers for Autumn and Winter 2025
Uniqlo HEATTECH is a thermal base-layer range designed for versatile winter layering and style, featuring items such as T-shirts, leggings, extra-warm cashmere-blend turtlenecks, trousers, socks, and accessories for men, women, and children. Its range covers three warmth categories: toasty, toastier, and toastiest, catering for varied cold conditions.
The collection, existing for over two decades, has evolved through thousands of fabric prototypes—about 10,000—to optimize trapping air, heat retention, stretch, and moisture absorption while maintaining a clean, timeless aesthetic. Clare Waight Keller serves as Uniqlo's creative director. The cashmere-blend pieces use ultra-thin yarn to remain semi-sheer and fluffy, thanks to special dyeing machines.
Variants include crew-neck long-sleeved T-shirts, scoop-neck and short-sleeved V-necks, ultra-warm leggings, water-repellent men's HEATTECH easy trousers with two-way stretch in long and short tapered styles, and kids' soft cotton fabrics for ages 3 to 13 with durable seams and non-itchy textures. The kids' line offers unisex scoop-neck T-shirts, stretchy leggings, and glitter tights featuring a non-twisting waistband.
HEATTECH's moisture-wicking properties aid travel and commuting by preventing clamminess, while socks and knee-highs keep feet warm. Styling guidance encourages layering HEATTECH under dresses with tights, pairing straight-leg jeans with warm turtlenecks, and extending summer wardrobes into autumn with tights, T-shirts, boots, or trainers. Notably, the ultra-warm range is knitted to retain extra heat via air pockets.
Personal tips from users highlighted include wearing thin HEATTECH layers for autumn and spring, using ultra-warm ranges in deep winter, washing garments cool to preserve quality, and utilizing water-repellent trousers for outdoor activities like dog walks. Families also widely adopt HEATTECH for warmth and practicality without bulk. The collection’s color variety adds options for stylish layering suitable for workplaces, dates, playdates, and outdoor walks.
A paid promotion titled The HEATTECH Edit features eight autumn layering looks for women, men, and children across diverse scenarios such as dog walks, offices, social outings, and children's playdates. The shopping tie-in lists prices for various items, including fleece cardigans, beanies, scarves, slim-fit chinos, PUFFERTECH vests and parkas, fluffy jackets, knit caps, pleated skorts, leggings, and socks.
Uniqlo’s Heart of Lifewear initiative, launched for the brand’s 40th anniversary in 2024, has donated over 1 million HEATTECH items and plans an additional donation of approximately 1 million by the end of 2025, with around half allocated to refugees returning to Syria.
This comprehensive promotion and guidance were published by The Guardian on 23 October 2025 with contributions from Rebecca Gonsalves, Emily Garland, Alexandra Fullerton, Priya Elan, and Charlotte Kewley.
