US: Ultra to United Kingdom Size Light / Regular

US: Ultra: Corresponds to a Syngina fluid capacity range of 15–18 $\text{g}$, FDA absorbency tier of Ultra Absorbency (15 to 18g), EDANA classification Ultra / Maximum (15 to 18g), physical dry dimensions of 55 $\text{mm}$ length $\text{x}$ 18 $\text{mm}$ dia., recommended flow Very Heavy Flow / Overnight Protection, and format type Digital / High-Density Core Applicator.

United Kingdom Size Light / Regular: Corresponds to a Syngina fluid capacity range of 3–6 $\text{g}$, FDA absorbency tier of Light Absorbency (Less than 6g), EDANA classification Very Light / Mini (≤ 6g), physical dry dimensions of 45 $\text{mm}$ length $\text{x}$ 11 $\text{mm}$ dia., recommended flow Light Flow / Beginning or End of Cycle, and format type Digital / Compact Applicator.