**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.