The Ultimate Blend of Play-Ready Durability and Eco-Conscious Comfort Upgrade your child’s everyday essentials with the Mightly Boys Organic Cotton Boxer Briefs 3-Pack. Designed by moms and built for active kids, these soft and stretchy boxer briefs combine a classic, stay-put fit with the world’s highest standards for organic textiles. Whether they are heading to school, playing sports, or just lounging at home, these briefs offer a modern silhouette that looks great while feeling incredibly soft against sensitive skin.
At Mightly, we believe kids' clothes should be as tough as they are kind to the planet. That’s why our boxer briefs are crafted from 95% GOTS-certified organic cotton and 5% spandex for a perfect, move-with-you stretch, grown without harmful pesticides and dyed with non-toxic, kid-safe pigments.
Certified Organic Comfort: Made with GOTS (Global Organic Textile Standard) cotton, ensuring the fabric is free from toxic chemicals, GMOs, and synthetic fertilizers.
Ethically Manufactured: Produced in a Fair Trade Certified™ factory, supporting fair wages and safe working conditions for the farmers and makers behind your clothes.
Sensitive Skin Friendly: Features a soft, fabric-covered elastic waistband and itch-free heat-transfer labels, making them the perfect choice for children with sensory sensitivities.
Built for Active Play: Designed with a functional fly and reinforced flatlock seams, these briefs are built to withstand frequent washes and high-energy sports without riding up or losing their shape.
Sustainable Staples: Durable construction and timeless colors make these 3-packs a reliable foundation for any wardrobe, designed to last through every growth spurt.
Includes: 3 Pairs of Boxer Briefs
Material: 95% Organic Cotton, 5% Spandex
Features: Functional fly and fabric-covered waistband
Fit: True to size with a comfortable, non-binding fit
Certifications: GOTS Certified, Fair Trade Certified
Care: Machine wash cold, tumble dry low
Origin: Designed in California, Made in India
Better for your child. Better for the people who make them. Better for the planet. Shop the Mightly collection today and experience the difference of truly sustainable kids' fashion.
Lion + Owl Body Size Chart
| Size | XS (4-6) | S (7-8) | M (10-12) | L (14-16) | XL (18-20) |
| Chest | 24-26" | 27-28" | 29-30.5" | 33.5-35.5" | 36.5-37.5" |
| Waist | 20.5-22" | 22-25" | 26-28" | 28-30" | 30-32" |
| Low Hip | 22.5-26" | 26-29.5" | 30-32" | 33-34" | 35-36" |
| Inseam | 19-21" | 22-24" | 25-27" | 28-30" | 31-33" |
L + O Team Tee
| Size | XS | S | M | L | XL |
| HPS Length | 15.75" | 17.75" | 19.75" | 21.75" | 23.75" |
| Chest Circ. | 27" | 29" | 31" | 33" | 35" |
| Bottom Opening | 26" | 28" | 30" | 32" | 34" |
EveryWear Hoodie
| Size | XS | S | M | L | XL |
| HPS Length | 15.75" | 17.75" | 19.75" | 21.75" | 23.75" |
| Chest Circ. | 27" | 29" | 31" | 33" | 35" |
| Sleeve Length | 14.25" | 14.375" | 14.875" | 15.125" | 15.25" |
Funday Joggers
| Size | XS | S | M | L | XL |
| Inseam | 21" | 22" | 24.5" | 25" | 25.5" |
| Waist Circ. | 20" | 22" | 23" | 26" | 28" |
| Hip Circ. | 29.5" | 31" | 32" | 35" | 36" |
All-Day Leggings
| Size | XS | S | M | L | XL |
| Inseam | 19.5" | 20.5" | 23" | 23.5" | 24" |
| Waist Circ. | 19" | 21" | 23" | 26" | 29" |
| Hip Circ. | 21" | 23" | 25" | 28" | 30" |
Baby Apparel
| Size | Weight |
| 0-3 Months | 7-12 lbs |
| 3-6 Months | 12-17 lbs |
| 6-12 Months | 17-22 lbs |
| 12-18 Months | 22-27 lbs |
| 18-24 Months | 27-30 lbs |
Kids Apparel
| Size | Height | Chest | Waist | Hip |
| 2 | 33"-36" | 20" | 20.5" | 20.5" |
| 3 | 35"-38" | 21.5" | 21.5" | 21.5" |
| 4 | 39"-42" | 22.5" | 22" | 22.5" |
| 5 | 41"-44" | 23.5" | 22.5" | 24" |
| 6 | 44"-47" | 24" | 23" | 25.5" |
| 7 | 47"-50" | 26" | 24" | 27" |
| 8 | 50"-53" | 27" | 24" | 28.5" |
| 10 | 53"-56" | 28" | 25" | 30" |
| 12 | 56"-59" | 30.5" | 27.5" | 31.5" |
| 14 | 58"-61" | 31.75" | 28" | 33" |
Baby Pajamas
| Baby Sizes | Height | Weight |
| Newborn | up to 18" | up to 7 lbs |
| 0 - 3 Months | 18 - 23" | 7 - 11 lbs |
| 3 - 6 Months | 23 - 27" | 11 - 15 lbs |
| 6 - 9 Months | 27 - 28 1/2" | 15 - 18 lbs |
| 9 - 12 Months | 28 1/2 - 30" | 18 - 22 lbs |
| 12 - 18 Months | 30 - 32" | 22 - 27" |
| 18 - 24 Months | 32 - 34" | 27 - 30" |
Baby Playwear
| Baby Sizes | Height | Weight |
| Newborn | up to 18" | up to 7 lbs |
|
0 - 3 Months |
18 - 23" | 7 - 11 lbs |
| 3 - 6 Months | 23 - 27" | 11 - 15 lbs |
| 6 - 9 Months | 27 - 28 1/2" | 18 - 22 lbs |
| 9 - 12 Months | 28 1/2 - 30" | 22 - 27lbs |
| 12 - 18 Months | 30 - 32" | 22 - 27lbs |
| 18 - 24 Months | 32 - 34" | 27 - 30" |
Baby Accessories
| Baby Accessory Sizes | Head Size | Weight |
| 0 - 6 Months | 16" | up to 15 lbs |
| 6 - 12 Months | 18" | up to 22 lbs |
Girls Underwear Size Chart
| Size | Numeric Size | Height | Weight |
| XX-Small | 2T/3T | 35" - 40" | 41 - 45 lbs |
| X-Small | 4T/5T | 41" - 46" | 46 - 52 lbs |
| Small | 6/7 | 47" - 50" | 53 - 59 lbs |
| Medium | 8 | 50" - 53" | 59 - 65 lbs |
| Large | 10 | 53" - 56" | 65 - 73 lbs |
| X-Large | 12 | 56" - 59" | 73 - 81 lbs |
| XX-Large | 14 | 59" - 62" | 81 - 95 lbs |
Girls Bralette Size Chart
| Size | Numeric Size | Height | Weight | Band |
| Medium | 8 | 50" - 53" | 59 - 65 lbs | 22" |
| Large | 10 | 53" - 56" | 65 - 73 lbs | 23" |
| X-Large | 12 | 56" - 59" | 73 - 81 lbs | 24 1/2" |
| XX-Large |
14 |
59" - 62" | 81 - 95 lbs | 26" |
Boys Underwear Size Chart
| Size | Height | Weight | Waist | Hip |
| X-Small (4/5) | 43" - 46" | 46 - 52 lbs | 23" | 24" |
| Small (6/7) | 47" - 50" | 53 - 59 lbs | 23 1/2" | 25 1/2" |
| Medium (8) | 50" - 53" | 59 - 65 lbs | 23 1/2" |
27" |
| Large (10) | 53" - 56" | 65 - 73 lbs | 24" | 28 1/2" |
|
X-Large (12) |
56" - 59" | 73- 81 lbs | 24 1/2" | 30" |
|
XX-Large (14) |
59"- 62" | 81 - 95 lbs | 25" | 31 1/2" |
Kids Sleepwear Size Chart
| Size | Height | Weight | Chest | Waist | Hip |
| 2T | 33" - 36" | 30 - 33 lbs | 20" | 20" | 21" |
| 3T | 36" - 39" | 33 - 36 lbs | 21" | 21" | 22" |
| 4T | 39" - 42" | 36 - 40 lbs | 22" | 22" | 23" |
| 5T | 42" - 45" | 40 - 44 lbs | 23" | 22" | 24" |
| 6 | 45" - 48" | 44 - 50 lbs | 24" | 23" | 25" |
| 7 | 48" - 51" | 50 - 55 lbs | 25" | 23" | 26" |
| 8 | 51" - 54" | 55 - 60 lbs | 26" | 23"" | 27" |
| 10 | 54" - 56 1/2" | 60 - 68 lbs | 27" | 24" | 28" |
| 12 | 56 1/2" - 59" | 68 - 75 lbs | 28" | 24" | 30" |
| 14 | 59" - 62" | 75 - 85 lbs | 29" | 25" | 31" |
Adult Unisex Sleepwear Size Chart
| Size | Inseam | Chest | Waist | Hip |
| X-Small | 30" | 34" | 26" | 36" |
| Small | 30.5" | 36" | 28" | 38" |
| Medium | 31" | 39" | 31" |
41" |
| Large | 31.5" | 42" | 34" | 44" |
|
X-Large |
31.5" | 46" | 38" | 48" |
|
XX-Large |
31.5" | 50" | 42" | 52" |
Kids Apparel Size Chart
| Size | Height | Weight | Chest | Waist | Hip |
| 2T | 33" - 36" | 33 - 37 lbs | 20 1/2" | 20" | 21" |
| 3T | 36" - 39" | 37 - 41 lbs | 21 1/2" | 21" | 22" |
| 4T | 39" - 42" | 41 - 45 lbs | 22 1/2" | 22" | 23" |
| X-Small (4/5) | 43" - 46" | 46 - 52 lbs | 23" - 24" | 23" | 24" |
| Small (6/7) | 47" - 50" | 53 - 59 lbs | 24 1/2" - 25 1/2" | 23 1/2" | 25 1/2" |
| Medium (8) | 50" - 53" | 59 - 65 lbs | 26 1/2" | 23 1/2" | 27" |
| Large (10) | 53" - 56" | 65 - 73 lbs | 27 1/2" | 24" | 28 1/2" |
| X-Large (12) | 56" - 59" | 73 - 81 lbs | 28 1/2" | 24 1/2" |
30" |
| XX-Large (14) | 59" - 62" | 81 - 95 lbs | 29 1/2" | 25" |
31 1/2" |
Kids Sock Size
| Size | Shoe Size |
| Small | 9 - 11 |
| Medium | 12 - 13 |
| Large | 1 - 4 |
Of an Origin (Pre-Pregnancy Measurements)
| OAO Size (combined) | OAO Size | Bust | Waist | Hip |
|
XS/S |
XS S |
33-35 36-37 |
25-26 27-28 |
34-36 37-38 |
|
M/L |
M L |
38-39 40-41 |
29-30 31-34 |
39-40 41-43 |
|
XL/1X |
XL 1X |
42-44 45-47 |
35-38 39-41 |
44-46 47-50 |
|
2X/3X |
2X 3X |
48-51 52-56 |
42-45 46-50 |
51-54 56-59 |
