4.5" Trunks First Line - Next Gen Iron-Underwear-TomboyX
4.5" Trunks First Line - Next Gen Iron-Underwear-TomboyX
4.5" Trunks First Line - Next Gen Iron-Underwear-TomboyX

First Line Leakproof 4.5" Trunks LC - Next Gen Iron

Regular price $28.99 Sale price $20.99 Save 28%


You asked and we listened. For our latest design we've lengthened the gusset for more absorption and coverage. First Line keeps you dry and comfortable while you're on the move. With built in leak protection for light days and incontinence these Trunks feature a floating gusset which can accommodate a pad with wings. Odor resistant and anti-bacterial while looking and feeling just like your regular Tomboys.

First Line underwear is made with OEKO-TEX® 100 Certified fabrics which are free from chemicals that are toxic to humans including PFOS and PFOA chemicals that have been shown to cause infertility or cancer. Learn more.

  • Fit-tested on all body types, sizes XS-4X
  • 95% OEKO-TEX Certified cotton, 5% spandex
  • Signature stay-put silky soft TomboyX waistband
  • Mid rise fit, 4.5" inseam
  • Holds 4 tsps of liquid
  • Smooth, durable flatlock seams won’t irritate or chafe
  • Machine wash cold in a mesh bag, line dry overnight. Avoid machine drying.
    Measure your chest at the fullest point to determine your size. If you are between sizes use the under bust measurement or size down.

    Measure your hips around the fullest part of your hips and bottom while keeping your feet together.  Keep the tape measure parallel to the floor and don’t pull too tight! 

    From our VERY REAL customers


    "Finding size 6X is already hard, but feeling incredible wearing it is harder, because its usually isn’t made with love. These were made for me and for my body. I can’t believe how sexy and comfortable I feel wearing these."


    "I could absolutely cry, I am so happy! I've never found a matching set of anything in my life because they don't make gender inclusive underwear for 16 years olds. Your company has made me feel so pretty and comfortable even if I'm the only one that knows what I have on"