**Product Specifications:**
**Brand:** QSTK
**Product Name:** Summer Sunscreen Upgrade
**Features:** Free ventilation switch, convex lens design for wearing glasses, SAFE
**Gender:** Unisex
**Color Options:** Multiple
**Certifications:** New national standard Class A 3C certification, Certificate Number: 2023011105558103
**Certification Authority:** China National Certification and Accreditation Administration (CNCA)
**Certification Entrustment:** Zhejiang Chuanghui Sports
**Safety Features:** Filter technology for effective sun protection, UV protection, glare isolation, clear vision
**Material:** ABS shell, thickened EPS cushioning layer (up to 20mm)
**Impact Resistance:** Effective shock absorption, better cushioning effect with 20mm EPS thickness
**Weight:** 700g
**Comfort:** Lightweight, breathable, detachable inner lining, adjustable head circumference (54-62cm)
**Ventilation:** Top ventilation design for airflow, adjustable head circumference for comfort
**Closure:** Buckle fastening, various color options
**Size:** 55-61cm (head circumference)
**Measurement Method:** Measure around the forehead and back of the head to determine head circumference
**Additional Details:** Sturdy lens base, long and short lens options
**Product Parameters:**
**Product Model:** 509
**Material:** Summer ABS+EPS
**Weight:** 700g
**Head Circumference:** 55-61cm
**Size Reference:** One size fits 54-62cm head circumference
**Note:** Please refer to the size chart for accurate measurement and selection of helmet size.
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