Bring good luck to every spin with this Boston Shamrock cycling cap, featuring a playful all-over shamrock pattern in classic green with bold white Boston text arched across the front for an Irish-inspired St. Patrick's Day vibe. Lightweight and sweat-wicking cotton blend fits comfortably under helmets for road cycling, coffee shop commutes, and festive group rides—perfect for Bostonians celebrating Emerald Isle heritage with stylish, breathable bike headwear.
Free shipping on all orders.
Products are made to order and are usually dispatched between 3-5 business days after placing your order.
Free Shipping is available on all orders. Shipping takes 7-10 days to USA, Canada, Singapore & Western Europe. 10-15 days to Australia, Mexico, other parts of Europe & Japan. 14+ days to everywhere else.
All customs duty & import tax (if any) are the buyer's responsibility. We will always mark the value down for you to avoid paying high taxes.
All items can be returned within 14 days of receipt. Return postage is the buyer's responsibility. Please get in touch prior to returning your item.
In the unlikely event that an item arrives damaged, you will be entitled to a full refund. Please provide photographic evidence.
Male Size Chart
| Size | Height (Feet) | Weight (Lbs) | Chest Circumference (Inches) | Waist (Inches) |
|---|---|---|---|---|
| S | 5'2.6" - 5'6.2" | 110 - 121 | 35 - 36.6 | 25.6 - 28 |
| M | 5'3.4" - 5'7.3" | 121 - 143 | 36.6 - 39 | 27.2 - 29.9 |
| L | 5'6.5" - 6'0.1" | 132 - 154 | 39 - 41.3 | 29.9 - 31.9 |
| XL | 5'8.1" - 6'0.8" | 154 - 176 | 41.3 - 43.7 | 31.9 - 33.9 |
| XXL | 6'1.3" - 6'3.2" | 165 - 187 | 43.7 - 46.1 | 31.9 - 35.8 |
| XXXL | 6'1.2" - 6'3.2" | 176 - 198 | 46.1 - 48.4 | 33.9 - 37.8 |
| 4XL | 6'1.2" - 6'5.2" | 187 - 209 | 48.4 - 50 | 35.8 - 41.7 |
| 5XL | 6'2.4" - 6'11.1" | 209 - 243 | 50 - 52.4 | 37.8 - 45.7 |
Male Size Chart (Metric)
| Size | Height | Weight | Chest Circumference | Waist |
|---|---|---|---|---|
| S | 158cm - 167cm | 50kg - 55kg | 89cm - 93cm | 65cm - 71cm |
| M | 160cm - 170cm | 55kg - 65kg | 93cm - 99cm | 69cm - 76cm |
| L | 168cm - 177cm | 60kg - 70kg | 99cm - 105cm | 76cm - 81cm |
| XL | 172cm - 184cm | 70kg - 80kg | 105cm - 111cm | 81cm - 86cm |
| XXL | 180cm - 190cm | 75kg - 85kg | 111cm - 117cm | 81cm - 91cm |
| XXXL | 185cm - 190cm | 80kg - 90kg | 117cm - 123cm | 86cm - 96cm |
| 4XL | 185cm - 195cm | 85kg - 95kg | 123cm - 127cm | 91cm - 106cm |
| 5XL | 188cm - 210cm | 95kg - 110kg | 127cm - 133cm | 96cm - 116cm |
Ladies' Size Chart
| Size | Chest Circumference (Inches) | Waistline (Inches) | Height (Feet) | Weight (Lbs) |
|---|---|---|---|---|
| XS | 30.2 - 31.9 | 22.3 - 24 | 4'9.1" - 5'1" | 77.2 - 99.2 |
| S | 31.8 - 32.7 | 23.9 - 26 | 4'11.8" - 5'4.2" | 88.2 - 110 |
| M | 32.6 - 33.5 | 26 - 28 | 5'1" - 5'5" | 99.2 - 110 |
| L | 33.4 - 35.8 | 27.1 - 29.9 | 5'3" - 5'6.9" | 106 - 117 |
| XL | 35.7 - 37.4 | 27.9 - 31.1 | 5'5" - 5'8.9" | 115 - 123 |
| XXL | 37.3 - 39 | 29.8 - 33.9 | 5'6.9" - 5'10.9" | 123 - 137 |
| XXXL | 38.9 - 40.6 | 31.8 - 35.8 | 5'8.9" - 6'0.8" | 132 - 154 |
Ladies' Size Chart (Sizing in cm)
| Size |
Chest Circumference (cm) |
Waistline (cm) | Height (cm) | Weight (kg) |
|---|---|---|---|---|
| XS | 77 - 81 | 57 - 61 | 145 - 155 | 35 - 45 |
| S | 81 - 83 | 61 - 66 | 152 - 163 | 40 - 50 |
| M | 83 - 85 | 66 - 71 | 155 - 165 | 45 - 50 |
| L | 85 - 91 | 69 - 76 | 160 - 170 | 48 - 53 |
| XL | 91 - 95 | 71 - 79 | 165 - 175 | 52 - 56 |
| XXL | 95 - 99 | 76 - 86 | 170 - 180 | 56 - 62 |
| XXXL | 99 - 103 | 81 - 91 | 175 - 185 | 60 - 70 |