Here in Colorado, we hike higher, breathe harder, and laugh louder—because we know the struggle is real when you're a mile (or two) high. That’s why 303 Threads brings you the “I Love Oxygen” tee, a breathable tribute to our favorite invisible life force.
Crafted for comfort and laughs, this shirt is perfect for mountain lovers, altitude rookies, and anyone who's ever underestimated a 14er. Whether you’re crushing trails or just catching your breath after walking up the stairs in Denver, this tee’s got your back (and your lungs).
Made from ultra-soft cotton with a fit that says “I love oxygen, but I also love looking good,” it’s your go-to gear for high-altitude humor and low-key flexing.
Bonus: Wearing this shirt may increase your chances of being handed trail mix by strangers.
Breath easy. Laugh hard. Rock the 303.
• 100% combed and ring-spun cotton
• Heather Prism Lilac & Heather Prism Natural are 99% combed and ring-spun cotton, 1% polyester
• Athletic Heather is 90% combed and ring-spun cotton, 10% polyester
• Other Heather colors are 52% combed and ring-spun cotton, 48% polyester
• Fabric weight: 4.2 oz/y² (142 g/m²)
• Relaxed fit
• Pre-shrunk fabric
• Side-seamed construction
• Crew neck
• Blank product sourced from Nicaragua, Honduras, or the US
This product is made especially for you as soon as you place an order, which is why it takes us a bit longer to deliver it to you. Making products on demand instead of in bulk helps reduce overproduction, so thank you for making thoughtful purchasing decisions!
Crafted for comfort and laughs, this shirt is perfect for mountain lovers, altitude rookies, and anyone who's ever underestimated a 14er. Whether you’re crushing trails or just catching your breath after walking up the stairs in Denver, this tee’s got your back (and your lungs).
Made from ultra-soft cotton with a fit that says “I love oxygen, but I also love looking good,” it’s your go-to gear for high-altitude humor and low-key flexing.
Bonus: Wearing this shirt may increase your chances of being handed trail mix by strangers.
Breath easy. Laugh hard. Rock the 303.
• 100% combed and ring-spun cotton
• Heather Prism Lilac & Heather Prism Natural are 99% combed and ring-spun cotton, 1% polyester
• Athletic Heather is 90% combed and ring-spun cotton, 10% polyester
• Other Heather colors are 52% combed and ring-spun cotton, 48% polyester
• Fabric weight: 4.2 oz/y² (142 g/m²)
• Relaxed fit
• Pre-shrunk fabric
• Side-seamed construction
• Crew neck
• Blank product sourced from Nicaragua, Honduras, or the US
This product is made especially for you as soon as you place an order, which is why it takes us a bit longer to deliver it to you. Making products on demand instead of in bulk helps reduce overproduction, so thank you for making thoughtful purchasing decisions!