6.35 to 8.89 cm (2.5 to 3.5 inches)
According to authoritative sources and comprehensive search results, the depth of baseball caps is generally divided into the following two standards:
1. Regular standard depth
Mainstream range: The depth of most brands and styles is between 6.35 and 8.89 cm (2.5 to 3.5 inches). This range can balance the sun protection effect and wearing comfort, especially for users with average head circumference.
Design basis: The depth is affected by the brand and function. The sports style may be deeper (such as close to 8.89 cm), and the fashion style may be shallower (such as 6.35 cm).
2. Special needs depth
Users with large faces/large head circumferences: You need to choose a deeper style of 11 to 14 cm to avoid making your face look bigger or not fitting well. For example:
The depth of the large head circumference cap is 11 cm;
The ideal depth is recommended to be 14 cm;
The MLB hardtop model can reach 17.5 cm.
Non-authoritative suggestions from Xiaohongshu and other sources: Some recommend more than 12 cm, but this needs to be verified in combination with the actual head circumference.
Selection suggestions
Try on first: The actual sizes of different brands (such as MLB baseball caps and Aicaigou B2B platforms) may vary;
Functional requirements: Choose a darker model (>8.89 cm) for outdoor activities, and a standard model for daily wear.
Summary: For ordinary users, refer to 6.35-8.89 cm, and for special needs, it needs to be extended to 11-17.5 cm, and the authoritative data and trial experience should be combined to make the selection.