Let young fans show their Seattle pride in this Youth Seattle Mariners Josh Naylor Cream Alternate Steelheads Nike Replica Jersey. This is a youth-sized Nike Replica baseball jersey, cut with a relaxed, fan-friendly fit and made for game days, watch parties, and everyday wear. The cream 'Steelheads' alternate honors the Seattle Steelheads, the city's Negro Leagues baseball club of the 1940s, whose throwback script the Mariners wear as a tribute to that history.About the Seattle SteelheadsThe Seattle Steelheads were a Negro Leagues team that played out of Seattle in the mid-1940s, part of the West Coast Negro Baseball League. The Mariners revived the Steelheads name and cream script uniform as a heritage alternate, celebrating an important and often overlooked chapter of the Pacific Northwest's baseball story.Nike Youth Replica MLB JerseyOfficially licensed MLB merchandiseRelaxed, fan-friendly Replica fitScreen-printed team wordmark, player name and numberFull-button front with tackle-twill styling cuesEmbroidered Nike swoosh on the chestLightweight 100% polyester:root{--pi-navy:#0b2c4a;--pi-navy-2:#0f3b62;--pi-border:#e6edf3;--pi-text:#0f172a;--pi-muted:#5b728a;--pi-card:#ffffff}.size-card{max-width:980px;margin:1.5rem auto;background:var(--pi-card);border:1px solid var(--pi-border);border-radius:14px;overflow:hidden;box-shadow:0 6px 20px rgba(16,24,40,.06);font-family:system-ui,-apple-system,Segoe UI,Roboto,Inter,Helvetica,Arial,sans-serif;color:var(--pi-text)}.size-card__header{background:linear-gradient(180deg,var(--pi-navy),var(--pi-navy-2));padding:20px 24px 18px;border-bottom:1px solid rgba(255,255,255,.12)}.size-card__header h2{margin:0 0 6px;font-size:clamp(1.15rem,2.2vw,1.55rem);line-height:1.15;letter-spacing:.4px;color:#fff;font-weight:800}.size-card__header p{margin:0;color:#d6e6f5;font-size:.95rem;font-weight:600}.table-wrap{overflow-x:auto}.size-table{width:100%;border-collapse:collapse;min-width:640px}.size-table caption{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;clip-path:inset(50%)}.size-table thead th{background:var(--pi-navy);color:#fff;text-transform:uppercase;letter-spacing:.06em;font-size:.9rem;padding:14px 16px;text-align:left}.size-table tbody td,.size-table tbody th{padding:16px;border-top:1px solid var(--pi-border);font-size:1rem;background:#fff}.size-table tbody th{background:#f8fbff;color:#0e2239;font-weight:700;width:34%}.size-table tbody tr:nth-child(even) td{background:#fcfeff}.tips{padding:18px 22px 22px;background:#f6f9fd;border-top:1px solid var(--pi-border)}.tips h3{margin:.2rem 0 .4rem;font-size:1rem;color:var(--pi-navy)}.tips ul{margin:.35rem 0 0 1rem;padding:0}.tips li{margin:.45rem 0;color:var(--pi-text);line-height:1.5}@media (max-width:640px){.size-card{border-radius:12px}.size-table{min-width:0}.size-table thead{display:none}.size-table tbody tr{display:grid;grid-template-columns:1fr 1fr 1fr 1fr;gap:0;border-top:1px solid var(--pi-border)}.size-table tbody th{grid-column:1 / -1;background:#f0f6ff;padding:14px 16px}.size-table tbody td{display:flex;flex-direction:column;justify-content:center;align-items:center;padding:12px 8px;border-top:1px dashed var(--pi-border);text-align:center}.size-table tbody td::before{content:attr(data-label);color:var(--pi-muted);font-weight:600;font-size:.72rem;text-transform:uppercase;margin-bottom:4px}}Youth Nike MLB Jersey Size ChartMeasurements in inches (in.)Youth Nike MLB Jersey Size ChartMeasurementS (8)M (10/12)L (14/16)XL (18/20)Chest (in.)2830¾32½34¼Waist (in.)24¼25¾26½27½Hip (in.)30¼3334½36½Length (in.)50-5757-6363-6565-67Pro tips:Between sizes? Size up for a roomier, longer-lasting fit.Youth sizes run S(8), M(10/12), L(14/16), XL(18/20).