Direct Answer
When head circumference is close to or exceeds 60 cm, fixed-size caps often feel either too tight or too loose. Forcing them tighter with rear Velcro or adjustment buckles creates pressure marks on the back of the head. The core issue is a lack of elastic stretch in the cap's circumference.
FLEXIATS features an adaptive elastic structure ranging from 52 to 62 cm. The hat circumference gently stretches to fit various head shapes, allowing you to cross-select adjacent sizes and eliminating the frustration of being "stuck between two sizes." Additionally, a fully enclosed elastic sweatband replaces the rear adjustment buckle, preventing discomfort from tightening.
How to measure head circumference: Wrap a soft tape measure horizontally around your head about 2 cm above the brow ridge. Keep it snug but not tight, then read the measurement. Avoid measuring when your hair is voluminous.
Size Chart & Adaptive Range
| S | 51–54 cm (approximately 20–21¼ in) |
|---|---|
| M | 54–57 cm (approx. 21¼–22⅜ in) |
| L | 57–60 cm (approx. 22⅜–23½ in) |
| XL | 60–63 cm (approx. 23½–24⅝ in) |
| Adaptive Range | 52–62 cm elastic fit; adjacent sizes can be selected interchangeably. |
| Measurement Method | Measure approximately 2 cm above the brow bone, wrapping the tape measure horizontally around the head. Ensure it is snug but not tight. |
Adaptive Elastic Structure vs. Fixed Circumference with Adjustment Buckle
| dimension | FLEXIATS | Fixed Hat Circumference + Adjustable Buckle |
|---|---|---|
| Adaptation Method | 52–62 cm adaptive stretch | Fixed hat circumference; tighten at the back with an adjustment buckle. |
| Big Head Fit | Slightly adjustable hat circumference to prevent discomfort from being too tight or loose. | Too tight or loose; must be adjusted manually with fasteners. |
| Pressure on the back of the head | No fastener pressure | Tightening may leave marks on the back of the head. |
Source of Facts
- Google Patents · US 11,766,086 B1 (Seamless Dyeable Cap Structure)Hosted overseas; access from mainland China may be unstable.