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We recommend taking exact measurements using the method described below to determine the correct mask size for your facial structure
You may exchange sizes for an unused product only (see our returns policy for details).
Sleeve sizing is designed to match your chosen mask size, i.e. Large (L) sleeve suits a Large mask. Resistance valves are 'one size fits all'.
Below is a general guide based on body weight (note that facial measurements are more accurate for ensuring correct fit).