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| Brand Name: | N/A |
| Model Number: | DHM1617 |
| MOQ: | 500MTS |
| Payment Terms: | T/T |
This 340GSM polyester spandex air layer knit is engineered specifically for premium hoodies and sweatshirts that require structure, warmth, and shape retention without heavy weight. The “air layer” construction features a three‑dimensional sandwich structure: two outer knit faces connected by a vertical pile of monofilament or textured yarns, creating a stable air cushion in the middle. At 340 grams per square meter (approximately 10 oz/yd²), this fabric sits between mid‑weight fleece and heavy French terry – thick enough to provide noticeable thermal insulation, yet light enough to avoid the stiffness of traditional 400GSM+ winter fabrics. The composition of 92% polyester and 8% spandex delivers 30‑40% stretch in the weft direction with over 90% elastic recovery, preventing hoodies from bagging at the elbows and cuffs after repeated wear. Unlike standard cotton fleece that pills, shrinks, and holds moisture, this air layer knit is quick‑drying, fade‑resistant, and maintains its loft through dozens of washes. The smooth outer face accepts screen prints and embroidery cleanly, while the inner air layer provides a soft, non‑scratchy feel against skin. This combination – 340GSM structural weight, spandex mobility, and thermal air retention – makes it the ideal fabric for streetwear hoodies, team sweatshirts, and performance casual outerwear.
| Parameter | Specification |
|---|---|
| Composition | 92% Polyester, 8% Spandex |
| Weight | 340 GSM ± 5% (grams per square meter) |
| Width | 152 cm cuttable |
| Structure | Air layer / spacer knit – double face with vertical connecting yarns |
| Stretch Type | 2‑way stretch (width direction) / mechanical + elastane |
| Pilling Resistance | Grade 4 (ISO 12945‑2) |
| Dimensional Stability | ≤ 3% shrinkage after 5 washes (40°C) |
Key Advantages & Proven Applications (Bullet Points)
Why this 340GSM air layer knit outperforms cotton fleece and French terry for hoodies
Frequently Asked Questions (Product‑Specific)
Q1: What exactly is “air layer” knit? How is it different from French terry or fleece?
A: Air layer (also called spacer fabric) consists of two separate knit faces connected by vertical monofilament or textured yarns. This creates a permanent air pocket that provides insulation without adding heavy wool or pile. French terry has loops on one side that can snag; fleece is brushed, which pills over time. Air layer has no loops or brushed surface – both faces are smooth, making it more durable, pilling‑resistant, and shape‑stable. The 340GSM air layer gives similar warmth to 400GSM fleece but with better breathability and recovery.
Q2: Is 340GSM too heavy for indoor wear or mild climates?
A: 340GSM (10 oz/yd²) is considered mid‑heavy. It is ideal for autumn, spring, and mild winter temperatures (5°C – 20°C / 40°F – 68°F). For indoor wear or warmer climates (above 22°C / 72°F), we recommend a 260‑280GSM air layer version. For severe winter conditions (below 0°C / 32°F), this fabric can be layered or we offer a 380‑400GSM air layer. However, most hoodie manufacturers choose 340GSM as the “sweet spot” – warm enough for outdoor casual wear, not too hot for indoor use.
Q3: How does the fabric perform after multiple washes? Does it lose loft or become flat?
A: After 30 home washes (30°C, mild detergent, line dry or low tumble), independent testing shows the air layer retains 90‑95% of its original thickness. The connecting vertical yarns are heat‑set during finishing, preventing collapse. Pilling resistance remains Grade 4. To maximize loft life: avoid fabric softeners (they coat fibers and reduce spacer recovery), wash inside out, and never use high heat drying (above 60°C). Under these conditions, the fabric maintains thermal performance for 100+ washes.
Q4: Can this 340GSM air layer be used for sublimation printing?
A: Yes, but with a note. The outer face is 100% polyester (spandex is also polyester‑based), so sublimation inks bond permanently. However, the air gap inside means that heavy ink saturation may slightly show through as a faint outline on the reverse face – not a problem for hoodies where the inner face is not visible. For light colors, we recommend using a white outer face and lighter ink loads. Screen printing is also excellent – no bleeding, no cracking. We recommend testing a small sample with your artwork.
Q5: How does the spandex content affect the hoodie’s fit over time?
A: The 8% spandex provides two key benefits. First, it allows the hoodie to stretch over the head without tearing the neck seam. Second, it prevents “memory bagging” – the permanent stretching that happens in cotton hoodies at elbows and the lower back. After a full day of wear, the fabric relaxes back to its original dimensions when laid flat. The elastic recovery is >90% at 50% elongation, which means the fit stays consistent for the life of the garment.
Q6: Is recycled polyester available for this 340GSM air layer knit?
A: Yes, we produce a GRS‑certified version using 100% recycled polyester (from post‑consumer PET bottles) combined with virgin spandex (recycled spandex not yet commercially available). The recycled version has identical weight, stretch, recovery, and thermal properties. MOQ for recycled poly is 1000 kg per color. OEKO‑TEX 100 certification is available for both standard and recycled versions. Contact us for sustainable streetwear programs.
