Finding the Right Fit Makes All the Difference
Period knickers only work as well as they fit — too loose and you risk leaks, too tight and you'll be uncomfortable all day. The good news? Finding your perfect fit is easier than you think. Here's everything you need to know.
Step 1: Know Your Measurements
Unlike regular underwear where you might just grab your usual size, period knickers work best when you measure yourself properly. You'll need two key measurements:
- Waist: Measure around the narrowest part of your waist.
- Hips: Measure around the fullest part of your hips and bottom.
Use a soft measuring tape and measure over bare skin or light clothing for the most accurate result.
Step 2: Check the Size Guide
Every brand sizes differently, so always refer to the specific size guide rather than assuming your usual size will apply. At ByFullstop., our size guide maps your measurements to the right size across all our styles.
Step 3: Consider Your Flow
Different styles are designed for different absorbency levels. Think about your typical flow:
- Light days or spotting — a lighter absorbency style works perfectly.
- Moderate flow — go for a mid-absorbency option for all-day confidence.
- Heavy flow or overnight — choose our highest absorbency styles for maximum protection.
Step 4: Choose Your Style
Period knickers come in a range of cuts — from briefs to hipsters to seamless styles. Consider what you'll be doing while wearing them:
- Everyday wear: A classic brief or hipster offers great coverage and comfort.
- Active days: A seamless style sits smoothly under leggings or gym wear.
- Overnight: Look for styles with extended back coverage for extra protection while you sleep.
Step 5: When in Doubt, Size Up
If you're between sizes, we always recommend sizing up. A slightly roomier fit is more comfortable and just as effective — and our 4-layer technology does the hard work regardless.
Still Not Sure?
Our team is always happy to help you find your perfect fit. Reach out via our contact page and we'll guide you through it. Your most comfortable period ever is just one size away.