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    "@type": "Product",
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    "generated_at": "2026-10-24T18:16:26+00:00",
    "post_type": "helmet",
    "metadata": {
        "id": 39001,
        "title": "GMax AT-21S Urban TC-1",
        "slug": "gmax-at-21s-urban-tc-1-5",
        "url": "https://helmetsan.com/zh/helmets/gmax-at-21s-urban-tc-1-5/",
        "language": "zh",
        "brand": "",
        "category": "Adventure/Dual Sport",
        "featured_image": "",
        "excerpt": "配备集成遮阳镜和可拆卸车顶的探险盔。 The GMax AT-21S Urban TC-1 is engineered as a high-integrity Full Face protective system by GMax, utilizing a structural shell constructed from Polycarbonate. This structural layup is engineered to provide progressive kinetic energy dissipation during impact deceleration, distributing localized shock across outer lamina layers while minimizing deformation transfer into the internal multi-density EPS liner. ... 阅读更多",
        "modified": "2026-09-09T05:42:06+05:30"
    },
    "identifiers": {
        "sku": "GMA-AT21-URB",
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        "mpn": "",
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    "specifications": {
        "brand": "N/A",
        "helmet_family": "AT-21S",
        "material": "N/A",
        "weight_g": 1650,
        "weight_lbs": "3.64",
        "homologation_standard": "DOT",
        "sharp_rating": "",
        "rotational_tech": "None",
        "strap_type": "Double D-Ring",
        "noise_db_at_100kph": 92,
        "comms_ready": "Generic Speaker Cutouts",
        "head_shape": "Intermediate Oval"
    },
    "variants": [],
    "compatible_motorcycles": [],
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        "currency": "USD",
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