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Siro Sleep Brief


That milkshake may bring all the boys to the yard, but this cheeky boy’s style brief is for the ladies! We’ve made some updates to this intimate silhouette, so now it’s everything you love and more. The flat jersey front, with ribbed jersey on the back, ties perfectly with the mixed fabric of our Siro Sleep Bralette. Looks great worn with the Siro Sleep Bralette or Siro Well-Rounded Bralette, or layered under our versatile Pima Cardigan.

  • Full coverage with a little cheekiness
  • Updated elastic waistband is soft and plush against the skin – no muffin tops here!
  • Ribbed binding with elastane means leg openings will retain their shape
  • Good for wild sleepers, hot sleepers and layering
  • Machine wash, cold + lay flat to dry
  • 92% siro micro modal, 8% spandex



Runs true to size but for a true boy brief fit, we suggest sizing up.


Kim is featured wearing the Bare/Bare, White/White, and Eclipse/Black colorways in size extra small. She is 5’11 with a 32” bust, a 25” waist, and has 36” hips.

Sam is featured wearing the Black/Black colorway in a size extra small. She is 5’4 with a 26” waist, a 34” bust, and 31” hips

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, please feel free to email us at We are happy to guide you!

Size XS S M L XL
Numerical 0 2-4 6-8 10-12 14
Bust 32-33 34-35 36-37 38-39 40-41
Waist 26 27-28 29-30 31-32 33-34
Hip 36 37-38 39-40 41-42 43-44
Inseam 29.5 30 30.5 31 31

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 visit our automated ONLINE RETURN PORTAL or email our customer happiness team at to initiate an exchange/return or with any further questions. THX!