It looks like a short note or directive. Here are a few clean, natural ways to express “keep-it-warm-avoid-cold”, depending on what you need:
Plain instruction
- “Keep it warm and avoid exposure to cold.”
- “Maintain warmth; avoid cold conditions.”
Short label / guideline
- “Keep Warm — Avoid Cold”
- “Warm Storage Only”
Health or care advice
- “Keep warm and protect from cold.”
- “Avoid cold temperatures; keep the area warm.”
More conversational
- “Make sure it stays warm and doesn’t get cold.”
If you tell me the context (medical advice, product storage, clothing, slogan, note on packaging, etc.), I can tailor it perfectly.