Name: The Flat Head Long Sleeve Indigo Knit Heavy Thermal
Brand: THE FLAT HEAD
SKU: TFH-FN-UTHL-001SP-TT-ID-38
Price: 540.0 EUR
Availability: InStock

The Flat Head Indigo Knit Heavy Thermal is an extraordinary long sleeve piece crafted from an ultra-heavy 23oz indigo-dyed thermal fabric. Knitted on specialized low-gauge machines using rope-dyed indigo yarns, it delivers the warmth of a thermal with the texture and presence of a heavyweight knit, developing rich contrast and character with wear.

The Flat Head Long Sleeve Indigo Knit Heavy Thermal

Fit Notes: All Flat Head tees run smaller than your regular American size, and this ultra-heavy model fits even smaller than standard Flat Head tees. If you usually wear a size 42 in Flat Head tees, you'll need to size up to a 44 in this one. If you're not familiar with Flat Head or other Japanese brands, a size 44 in this model is between a US Medium and Large. In any case, as always, we recommend checking our size chart to ensure the perfect fit.

David wears a size 42 thermal. He is 185cm (6ft 1") tall and weighs 76kg (167 Lbs). He usually wears a size M or L in American brands.

cm inch

SIZE	38 (S)	40 (M)	42 (L)	44 (XL)
Chest	100	105	112	117
Shoulders	49	51.5	55	58
Waist	52	54	56	58
Opening	52	54	56	58
Lenght	63	67	69	73
Sleeve	56.5	57.5	60	63

To make sure that you choose the right size, we recommend that you take a tape measure to size a favourite garment from your wardrobe and compare its measurements to the sizing chart of the garment you are about to acquire(How we measure our clothes).

This Heavy Indigo Thermal from The Flat Head is built using a truly exceptional 23oz fabric, far heavier than conventional thermal knits. The yarns are rope-dyed with natural indigo at a historic Japanese dye house with over 130 years of expertise, leaving a white core that gradually reveals itself through wear and washing, creating dramatic, high-contrast aging unique to indigo garments.

Unlike standard thermal fabrics, this piece is knitted on dedicated machines capable of handling extremely thick yarns, resulting in a low-gauge, knit-like structure that feels substantial yet flexible. The texture is bold and three-dimensional, offering excellent stretch, moisture absorption, and breathability—making it versatile enough to wear as a spring knit or a cold-weather base layer.

Indigo-dyed ribbing is used throughout, ensuring uniform fading across the garment rather than isolated color loss. The neckline is finished with The Flat Head’s signature three-needle, one-off stitch construction, using thick cotton thread for long-term durability and a distinctive vintage look.

This is a statement piece rooted in traditional Japanese craftsmanship, designed to age beautifully and last for years.

Visit our LOOKBOOK and discover a great selection of heritage street-style outfits

• 23oz ultra-heavy indigo thermal knit
• Rope-dyed indigo yarns with white core for dramatic aging
• Knitted on specialized low-gauge machines
• Knit-like texture with excellent stretch and breathability
• Indigo-dyed ribbing for consistent fading
• High moisture absorption and comfort
• Signature Flat Head three-needle neckline construction
• 100% cotton
• Made in Japan

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If for some reason you are not happy with your purchase you can return it to us within 14 days for a size exchange or refund.

For more info please visit our returns & exchange page.

Please note that items in the SALE category are considered FINAL SALE, with no returns or exchanges accepted.