| S | 74 | 35.1 | 56 | 49.5 | 73 | 17 |
| M | 77.5 | 36 | 57 | 50.5 | 76.5 | 18 |
| L | 81.5 | 37 | 58 | 51.5 | 80.5 | 19 |
| XL | 85.5 | 38 | 59 | 52.5 | 84.5 | 20 |
| XXL | 89.5 | 39 | 59.4 | 53 | 88.5 | 21 |
Notes:
Size measurements are averages from five randomly sampled products; slight variations may occur between batches.
If measurements fall between two sizes, smaller size offers a closer fit, larger size offers a looser fit.
When chest and waist measurements suggest different sizes, chest measurement should be prioritized.
Data sourced from third-party testing agencies.
Certified for breathability (GB/T 5453-1997), far-infrared heating (GB/T 30127-2013), and durability standards (GB/T 30).
Usage:
Ideal for layering and versatile warmth in mild cold conditions (15°C to 25°C).
Suitable for daily wear with high comfort and functional performance.
Additional Information:
beneunder focuses on essential, lightweight outdoor apparel without unnecessary functional add-ons.
Product designed to balance comfort, warmth, breathability, and durability for everyday use.
| Width | 24.7 |
| Height | 1.7 |
| NetWeight | 0.3 |
| Brand | beneunder |
| Product Name | POLO Collar Base Layer Shirt |
| Fabric | Dual-fiber oxygen brushed fabric (1.0T superfine fiber), soft and durable after multiple washes, unlike traditional cotton fabrics that harden and cause skin irritation. |
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| Elasticity |
| High-elasticity structure with 4.2% spandex, knitted rib structure, stretch rate 187.3%, recovery rate 93.6%, providing a slim fit without tightness or restriction. |
| Expansion Design | Underarm and hem feature wave elastic yarn for unrestricted movement. |
| Seam Technology | Invisible seamless stitching in high-friction areas (shoulder, sleeves, side seams) for zero skin friction. |
| Thermal Technology | Far-infrared heating technology using high-density nylon fiber, lightweight yet warm, increases temperature by +1.9°C. |
| Breathability | High breathability fabric with air permeability of 341.3 mm/s, prevents stuffiness and sweat accumulation. |
| Temperature Control | Half-zip design allows flexible temperature regulation; unzip for ventilation, zip up for warmth. |
| Fit & Style | Slim fit Polo collar style with structured shoulder cut, embossed rib texture, mermaid side seams for waist shaping, curved hem to conceal abdomen. |
| Comfort | Skin-friendly, no binding, no friction, lightweight warmth suitable for 15°C to 25°C. |
| Durability | Machine washable, resistant to deformation, fading, snagging, and pilling; certified quality according to GB/T standards. |
| Color Options | Qingyan Blue, Yuanlu Mi (Beige), Manmu Black. |