US: F / 2XL to United Kingdom Size M (Medium)
Cross-market women’s hosiery and tights conversion mapping F / 2XL specifications into M (Medium).

Analyzing Women’s Hosiery Size Equivalence Across Markets
US: F / 2XL: Corresponds to a stature height range of 172–190 (68–75 ), weight range of 95–115 kg (209–253 lbs), denier rating 50D–150D Extra Support / Compression, and fit classification Extended Plus / Compression Support.
United Kingdom Size M (Medium): Corresponds to a stature height range of 152–165 (60–65 ), weight range of 50–62 kg (110–136 lbs), denier rating 15D–60D Sheer to Opaque, and fit classification Standard / Regular Fit.