HOME COLLECTIONS LITTLE DOLFIN COLLECTION LITTLE DOLFIN BOYS' BUILD ME UP SWIM TRUNKS WITH ELASTIC WAISTBAND

Little Dolfin Boys' Build Me Up Swim Trunks with Elastic Waistband Style #9L01BU-E13

Limited Availability, get it while it lasts!

Turn every splash into a stackable adventure with the Little Dolfin Build Me Up Swim Trunks, now with an updated inseam for extra comfort. Just like the blocks they love building towers with, this vibrant style will empower them to build their skills in the water. These trunks are crafted from 100% polyester microfiber for lightweight, quick-drying comfort, making them essential for long pool days. The updated inseam works in tandem with the elastic waistband for extra comfort and carefree movement. With Build Me Up swim trunks, every swim builds on energy and fun.

Features & Benefits
  • Boys’ swim trunk in Build Me Up print
  • 100% polyester microfiber
  • Quick-drying, lightweight, and soft
  • Elastic waistband for secure fit
  • Updated inseam for extra coverage and comfort
  • Durable and chlorine-resistant
  • Flexible fit for swimming and active play
  • Bright colored print for easy visibility in the water

Fabric Content: 100% Polyester Microfiber

Match this suit with their swim school buddy or the whole family with Women's V-Back One Piece, Uglies Girls' One Piece, Men's Jammer, or Little Dolfin Girls' One Piece.
Product Details

Limited Availability, get it while it lasts!

Turn every splash into a stackable adventure with the Little Dolfin Build Me Up Swim Trunks, now with an updated inseam for extra comfort. Just like the blocks they love building towers with, this vibrant style will empower them to build their skills in the water. These trunks are crafted from 100% polyester microfiber for lightweight, quick-drying comfort, making them essential for long pool days. The updated inseam works in tandem with the elastic waistband for extra comfort and carefree movement. With Build Me Up swim trunks, every swim builds on energy and fun.

Features & Benefits
  • Boys’ swim trunk in Build Me Up print
  • 100% polyester microfiber
  • Quick-drying, lightweight, and soft
  • Elastic waistband for secure fit
  • Updated inseam for extra coverage and comfort
  • Durable and chlorine-resistant
  • Flexible fit for swimming and active play
  • Bright colored print for easy visibility in the water

Fabric Content: 100% Polyester Microfiber

Match this suit with their swim school buddy or the whole family with Women's V-Back One Piece, Uglies Girls' One Piece, Men's Jammer, or Little Dolfin Girls' One Piece.
Fit & Size

Sizing & Measuring (Inches)

SIZE CHEST (IN) WAIST (IN)
2T 20 19-19.5
3T 21 20-20.5
4T 22 21-21.5
4 22 22
5 23 22.5
6 24.5 23.5

How to Measure

When an athlete's measurement contains a partial inch, always round up to the next full inch. If an athlete's measurements fall across two sizes, order the larger size.

  1. Chest Measurement

    Measure the chest with arms at the side. Be sure to take the measurement at the fullest part of the chest.
  2. Waist Measurement

    Measure the waist at the natural waistline which is the narrowest part of the waist. If you're having trouble locating the natural waist, have the athlete bend to the side. The natural waist is where the body bends.
  3. Hip Measurement

    Take the hip measurement at the fullest part of the buttocks with the athlete's feet together.
  4. Torso Measurement

    Take the torso measurement from the center of the shoulder, down the torso, through legs, and back to the shoulder.
  5. Inseam Measurement

    Take the leg inseam measure the athlete without shoes by running the tape from the crotch to one inch above the floor.
Sizing Illustration

The goal of measuring is to determine the correct size to order for each athlete. Accurate measurements are vital to the proper fit of your athlete's apparel. Please make sure that all athletes are wearing fitted workout apparel during the measurement session.


Fabric Care

Dolfin offers fabrics that are produced to meet our exclusive stretch and quality standards. We take tremendous pride in having the best fabrics in the industry. As the leader in performance apparel, it's important for us to advise you of the tendencies of certain fabrics, as well as practices to avoid. Show More

Shipping & Returns

For more information on our shipping click here

Dolfin Swimwear gladly accepts customer returns provided the following conditions are met:

  • All return requests must be sent no more than 30 days after shipment of merchandise.
  • Returns must be processed through Returns (dolfinswimwear.com) in order to be accepted.
  • Merchandise must not have been worn or laundered and must have all hang tags and sew-in tags attached in their original position and condition.
  • The customer is responsible for all shipping charges.

Stock items ordered with embellishments are considered customized and are non-returnable. The exception to this is in the case of a Manufacturers error or defect (Refer to Returns: Special Order Items section for more information.)