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Siro Sleep Brief


A masculine style short adapted for the modern women. The Siro Sleep Brief is so soft, you’ll forget it’s on. Constructed with a fine, shrink-resistant Japanese elastic waistband, and Siro Modal cotton to ensure a heavenly fit for your body. Looking for its upper half? Try the Siro Bralette.

  • Full coverage
  • Sits at the hip
  • Japanese elastic waistband
  • 95% siro modal and 5% spandex
  • For sanitary reasons, all underwear orders are final sale
  • Made in Los Angeles


Runs true to size but if you are typically between sizes, we suggest you size up.

Model in Black/White and Camel/White is wearing a S. Height: 5’9, Waist: 25", Bust: 34" Hips: 35"

Model in Black is wearing a M. Height: 5’9, Waist: 28", Bust: 34" 

Unsure of your size? No need to lose sleep over it - we are here to help! To ensure proper fit, please refer to the fit guide below and if you have any questions, visit Lunya's Fit Guide - we are happy to guide you!

Size XS S M L XL
Numerical 0 2-4 6-8 10-12 14
Bust 33 34-35 36-37 38-39 40-41
Waist 26 28 30 32 34
Hip 36 37-38 39-40 41-42 43-44
Inseam 30 30.5 31 31.5 32

Measurements are in inches and refer to body size, not garment dimensions. Please note that fits may vary by style and personal preference.

Need help with your size? Have a suggestion or feedback?

Lunya gladly accepts exchanges and free returns of unworn/unwashed items with the original tags attached within 30 days of your order ship date. Underwear, Gift Cards, & Sale Items are nonrefundable. Please email to initiate a hassle free exchange/return or with any further questions. THX!

The Difference

Thoughtful Fabric: Siro Micro Modal is an environmentally friendly, sustainably produced fabric known for being extremely smooth, soft, and cool to the touch. The fabric is resistant to shrinkage, fading, and hard water deposits (so it stays soft). It’s also extremely breathable, excellent at absorbing moisture, and shows minimal pilling. The 5% spandex allows freedom of movement without bunching.

Intelligent Design: We took special care to create a boyshort with no center seams because we know what does (and doesn't) feel good on a woman's body.