Tri-Top Chest Binder

by Underworks

The Tri-Top chest binder is one of the strongest of Underworks' compression chest binders and is designed to give you a binder that fits right, feels good, and hides discretely underneath your clothing, with no seams or bunching.
  • Uses 70% nylon/30% spandex medical-grade compression material for a tight, firm fit that moves with you
  • Three layers of compression across the front can flatten any bulges, while a single layer across the back helps engage the muscles of your whole upper torso for increased comfort.
  • This Underworks binder is a mid-tummy length, perfect for when you just need some help with your chest or want to wear shorter shirts
  • Made in the USA 

X-small 28-30 / Small 31-33 / Medium 34-36 / Large 37-40/ X-large 41-44 / 2X 45-48 / 3X 49-52

    MEASURE YOUR CHEST - With arms down on the side, take a snug measurement around the fullest part of your chest over the nipples.

    If unsure, please order the next size up.


    Wash in cold water, gentle cycle, tumble dry low or flat dry. No bleach, no iron.

    Check out our complete guide to binding for FTMs.

    Customer Reviews

    Based on 19 reviews
    lucas james
    very diffrent material to gc2b but binds very well

    good binder scrachy under armpits

    Alex Labonte
    Best binder ever!

    This is the most comfortable binder. It really covers all the skin and my chest is so flat compared to when I'm wearing other binders. I love it so much. <3

    connor keliher


    Avery Tuck
    First and Best Binder

    Sizing was simple for me. The material was rougher than I expected but it flattens perfectly.
    I can finally be the boy I feel like inside thanks to this product.
    Thank you. So much.
    I will continue to order from this site for a while now for adorable, working, binders

    Pat Scanlon
    It does what it says it does!

    Satisfied customer.


    Your order will typically ship within 2-3 business days after purchase.

    **Our Warehouse is moving which may cause an extra 3-4 days delay in fulfillment and delivery times until the end of June.

    Please note that print-to-order apparel items, such as t-shirts, hoodies, etc... require additional processing time and will be shipped separately.


    STP, Packer, Harness, Swimwear and Underwear sales are final. They cannot be exchanged or returned due to legal restrictions. Please consult size charts carefully; Sizes vary between brands. It's recommended to get accurate measurements taken by a pal. All other returns are issued as in-store credit only.

    International Orders

    Please note that for all non-US orders, you may be charged local taxes to retrieve your order.

    Additionally, all international sales are considered final. See our Shipping Policies for more details.