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Siro Sleep Bralette


A good night’s sleep will leave you feeling well-adjusted and so will our Siro Sleep Bralette, because it’s adjustable! A movable slider on t-back strap provides a fantastic custom fit, so you always feel supported, regardless of torso length or chest size. The mix of flat jersey on the front, with ribbed jersey on the back, provides maximum comfort but with a bit of added texture, and the subtle Lunya logo at the ultra-comfy elastic band makes it the perfect pairing with the Siro Sleep Brief.

  • Racerback design—now adjustable!
  • Updated elastic band in soft plush fabric—won’t dig in or create lumps and bumps
  • Good for wild sleepers, hot sleepers, and for layering
  • Machine wash, cold + lay flat to dry
  • 92% siro micro modal, 8% spandex



Meant for women with A to C cups. For those of you more endowed, try our Siro Well-Rounded Bralette.


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!