1. Basic Product Info Product Category: Basic Solid Color Sweatshirts Product Name: Brand Model Winter Layering Crew Neck Tee, Colorfast Soft Cotton Undershirt for Men & Women Short Description: Made from premium 21S Xinjiang compact siro-spun combed cotton with 230GSM weight, this unisex loose-fit long sleeve tee comes in classic black & white, sizes S–4XL. Pre-shrunk fabric delivers minimal shrinkage & anti-pilling performance; sun-resistant eco reactive dye prevents fading. Reinforced stitching on neck, shoulder, cuffs and hem guarantees long-lasting shape retention. Ideal for autumn & winter inner layering, casual daily wear and loungewear. 2. Detailed Product Description Our unisex long-sleeve base layer (SKU SJY6512) is crafted from high-quality 230GSM 100% compact siro-spun combed cotton sourced from premium Xinjiang long-staple cotton. Manufactured with 21-count spinning plus fixed-color reactive dyeing, this long sleeve solves common drawbacks of ordinary cotton tops such as excessive shrinkage, pilling and color fading, making it a reliable staple for transitional and cold seasons. Thanks to compact tightly-twisted yarn construction, the fabric avoids loose fiber fallout to resist pilling even after repeated washes. As pure natural cotton material, it combines soft skin-friendly touch, decent breathability and moderate heat retention. Free from harsh chemical additives, it works perfectly for sensitive-skin wearers of all ages. We adopt sunlight-proof eco reactive pigment for dyeing, which locks color firmly so garments stay vivid without fading under long-time sunlight exposure or frequent laundry cycles. Designed in a relaxed unisex silhouette with zero redundant detailing, the top leaves ample room for body movement. The roomy hem prevents hip tightness while fitted ribbed cuffs block cold wind and preserve body warmth, perfectly matching its core positioning as winter inner base layer. Timeless black and white neutral tones match jeans, joggers, jackets and overcoats effortlessly for versatile daily outfits. Four-part reinforced sewing upgrades durability greatly. Double-needle rib crew neck avoids curling deformation; fully wrapped shoulder with six-thread overlock and through-shoulder binding stops shoulder sagging and seam splitting; neatly stitched rib cuffs prevent fraying; double-chain hem stitching keeps bottom edge flat and smooth. All pieces undergo pre-shrinking and color fixation before factory delivery to cut shrinkage and bleeding risks effectively. Covering inclusive sizing S to 4XL, this all-season essential fits casual outings, home relaxation, mild workout and blank custom printing, balancing comfy wearing experience and multi-scene practicality. 3. Product Specification

SKU	SJY6512
Fabric	100% Xinjiang Combed Compact Siro Spun Cotton
Fabric Weight	230GSM
Yarn Count	21S
Available Colors	Solid Black, Pure White
Size Range	S-4XL
Fit	Unisex for Men & Women
Core Craft	Fixed weaving & dyeing, pre-shrunk treatment, sun-resistant high color-fast reactive dye

Size	Body Length	Chest Width	Shoulder Width	Sleeve Length	Recommended Height(cm)	Recommended Weight(lbs)
S	65	48	47	57	160-165	88-99
M	67	50	49	58	165-170	104-121
L	69	52	51	59	170-175	121-138
XL	71	54	53	60	175-180	138-160
2XL	73	56	55	61	180-185	160-176
3XL	75	58	57	62	185-190	176-193
4XL	77	60	59	62	185-195	193-220

Note: All dimensions measured flat manually, 1~3cm deviation is acceptable industry tolerance. Fabric pre-shrunk with shrinkage controlled under 3% after cold gentle wash. Minor color difference caused by shooting lighting & display screen is not a product defect. 4. Application Scenarios ● Autumn & Winter Inner Layering: Wear under shirts, hoodies, jackets, down coats & overcoats to lock warmth without bulky look. ● Daily Casual Outfit: Single wear in spring & autumn with denim pants, sweatpants for shopping, commuting and outdoor strolls. ● Home Loungewear & Nightwear: Loose soft cut offers unrestricted comfort for indoor relaxing and sleeping. ● LightSports Wear: Suitable for yoga, jogging and home fitness; breathable fabric wicks sweat without sticky constraint. ● Blank Custom Apparel: Plain solid cotton base for screen print, heat transfer, DTG & embroidery; ideal for team uniform, brand merchandise and club custom wear. 5. Core Product Advantages ● Premium Xinjiang Long-staple Cotton: Longer cotton fiber brings superior softness, better breathability and warmth than ordinary carded cotton. ● Optimized 230GSM Weight: Thick enough for cold winter inner insulation yet lightweight for single spring/autumn wear, usable across three seasons. ● Anti-pilling & Low Shrinkage: Compact siro spinning plus factory pre-shrinking limits shrinkage within 3% and prevents fuzz after long-term washing. ● 4-way Reinforced Stitching: Reinforced rib neck, fully bound shoulder, tidy cuff stitching & double-chain hem greatly extend service life and anti-deformation performance. ● Full Inclusive Unisex Sizing: S-4XL sizing fits from slim to plus-size body types (80lb~200lb original jin range), loose cut suits all body shapes. ● Timeless Minimalist Design: Plain black & white matches all bottoms and outwear, never out of fashion for multi-style matching. ● Safe Eco Dye Craft: Sun-resistant high-fastness reactive dye is skin-friendly with no harmful chemical residue, friendly for sensitive skin and anti-fade under long sunlight. ● Ergonomic Tailoring: Relaxed torso avoids waist/hip tightness; rib cuffs seal wrists against cold wind; classic crew neck stays snug around neck without rolling. FAQ Section Q1: Will this long sleeve shrink or fade after washing? A: All tops go through pre-shrinking and high-color-fastness fixation before shipment. Gentle cold machine wash leads to under 3% shrinkage with barely visible size change. Our sunlight-proof reactive dye causes minimal initial bleeding in separate cold wash; no further fading or color run afterward. Avoid hot water & high-heat tumble drying to prolong garment lifespan. Q2: Is 230GSM too thin for winter or too heavy for mild weather? A: Our tested 230GSM is a versatile all-year weight. It works as warm inner layer under coats in cold winter while breathable enough for standalone spring/autumn wear without overheating. Q3: Can this tee be worn as inner layer under shirts and jackets? A: Absolutely. Streamlined shoulder & armhole cut sits smoothly under all outerwear without bunching or bulking, perfect layered staple for fall and winter styling. Q4: How to pick size if my height & weight falls between two sizes? A: Pick up one larger size for relaxed fit or winter layering; choose smaller size for regular tailored single wear. Cross-check chest & length data on size chart for more precise selection. Q5: Does the cotton fabric pill easily or deform over long-time use? A: Compact siro combed cotton features tight fiber structure with 80% better anti-pilling effect than regular carded cotton. Reinforced seam details on neck, shoulder and hem effectively stop out-of-shape issues after frequent wash and pull. Q6: Does the crew neck roll up easily after multiple washes? A: Elastic rib fabric + double-needle lockstitch on neck edge keeps round shape firmly. No curling or flaring occurs after repeated wearing and cleaning.